STORY HIGHLIGHTS

  • FIRST ON CNN: New documents formed the basis of story on news site, Intercept
  • The site is run by Glenn Greenwald, who published leaks by Edward Snowden
  • Article focuses on the growth of names on terror databases during the Obama administration

(CNN) — The federal government has concluded there's a new leaker exposing national security documents in the aftermath of surveillance disclosures by former NSA contractor Edward Snowden, U.S. officials tell CNN.

Proof of the newest leak comes from national security documents that formed the basis of a news story published Tuesday by the Intercept, the news site launched by Glenn Greenwald, who also published Snowden's leaks.

NSA leaker Edward Snowden asks to extend Russia asylum

One year of Edward Snowden's revelations

Snowden: 'I was trained as a spy'

Jonathan Pollard is a divisive figure in U.S.-Israeli relations. The former U.S. Navy intelligence analyst was caught spying for Israel in 1985 and was sentenced in 1987 to life imprisonment. The United States and Israel are discussing his possible release as part of efforts to save fragile Middle East peace negotiations, according to sources familiar with the talks. Click through the gallery to see other high-profile leak scandals the United States has seen over the years.Jonathan Pollard is a divisive figure in U.S.-Israeli relations. The former U.S. Navy intelligence analyst was caught spying for Israel in 1985 and was sentenced in 1987 to life imprisonment. The United States and Israel are discussing his possible release as part of efforts to save fragile Middle East peace negotiations, according to sources familiar with the talks. Click through the gallery to see other high-profile leak scandals the United States has seen over the years.

Military analyst Daniel Ellsberg leaked the 7,000-page Pentagon Papers in 1971. The top-secret documents revealed that senior American leaders, including three presidents, knew the Vietnam War was an unwinnable, tragic quagmire. Further, they showed that the government had lied to Congress and the public about the progress of the war. Ellsberg surrendered to authorities and was charged as a spy. During his trial, the court learned that President Richard Nixon's administration had embarked on a campaign to discredit Ellsberg, illegally wiretapping him and breaking into his psychiatrist's office. All charges against him were dropped. Since then he has lived a relatively quiet life as a respected author and lecturer.Military analyst Daniel Ellsberg leaked the 7,000-page Pentagon Papers in 1971. The top-secret documents revealed that senior American leaders, including three presidents, knew the Vietnam War was an unwinnable, tragic quagmire. Further, they showed that the government had lied to Congress and the public about the progress of the war. Ellsberg surrendered to authorities and was charged as a spy. During his trial, the court learned that President Richard Nixon's administration had embarked on a campaign to discredit Ellsberg, illegally wiretapping him and breaking into his psychiatrist's office. All charges against him were dropped. Since then he has lived a relatively quiet life as a respected author and lecturer.

Wen Ho Lee was a scientist at the Los Alamos Laboratory in New Mexico who was charged with 59 counts of downloading classified information onto computer tapes and passing it to China. Lee eventually agreed to plead guilty to a count of mishandling classified information after prosecutors deemed their case to be too weak. He was released after nine months in solitary confinement. Lee later received a $1.6 million in separate settlements with the government and five news agencies after he sued them, accusing the government of leaking damaging information about him to the media.Wen Ho Lee was a scientist at the Los Alamos Laboratory in New Mexico who was charged with 59 counts of downloading classified information onto computer tapes and passing it to China. Lee eventually agreed to plead guilty to a count of mishandling classified information after prosecutors deemed their case to be too weak. He was released after nine months in solitary confinement. Lee later received a $1.6 million in separate settlements with the government and five news agencies after he sued them, accusing the government of leaking damaging information about him to the media.

Members of the Bush administration were accused retaliating against Valerie Plame, pictured, by blowing her cover in 2003 as a U.S. intelligence operative, after her husband, former Ambassador Joe Wilson, wrote a series of New York Times op-eds questioning the basis of certain facts the administration used to make the argument to go to war in Iraq. Members of the Bush administration were accused retaliating against Valerie Plame, pictured, by blowing her cover in 2003 as a U.S. intelligence operative, after her husband, former Ambassador Joe Wilson, wrote a series of New York Times op-eds questioning the basis of certain facts the administration used to make the argument to go to war in Iraq.

In 2007, Lewis "Scooter" Libby, Vice President Dick Cheney's former chief of staff, was convicted on charges related to the leak of the identity of CIA operative Valerie Plame. Libby was convicted of obstruction of justice and perjury in connection with the case. His 30-month sentence was commuted by President George W. Bush. Cheney told a special prosecutor in 2004 that he had no idea who leaked the information. In 2007, Lewis "Scooter" Libby, Vice President Dick Cheney's former chief of staff, was convicted on charges related to the leak of the identity of CIA operative Valerie Plame. Libby was convicted of obstruction of justice and perjury in connection with the case. His 30-month sentence was commuted by President George W. Bush. Cheney told a special prosecutor in 2004 that he had no idea who leaked the information.

Aldrich Ames, a 31-year CIA employee, pleaded guilty to espionage charges in 1994 and was sentenced to life in prison. Ames was a CIA case worker who specialized in Soviet intelligence services and had been passing classified information to the KGB since 1985. U.S. intelligence officials believe that information passed along by Ames led to the arrest and execution of Russian officials they had recruited to spy for them.Aldrich Ames, a 31-year CIA employee, pleaded guilty to espionage charges in 1994 and was sentenced to life in prison. Ames was a CIA case worker who specialized in Soviet intelligence services and had been passing classified information to the KGB since 1985. U.S. intelligence officials believe that information passed along by Ames led to the arrest and execution of Russian officials they had recruited to spy for them.

Robert Hanssen pleaded guilty to espionage charges in 2001 in return for the government not seeking the death penalty. Hanssen began spying for the Soviet Union in 1979, three years after going to work for the FBI and prosecutors said he collected $1.4 million for the information he turned over to the Cold War enemy. In 1981, Hanssen's wife caught him with classified documents and convinced him to stop spying, but he started passing secrets to the Soviets again four years later. In 1991, he broke off relations with the KGB, but resumed his espionage career in 1999, this time with the Russian Intelligence Service. He was arrested after making a drop in a Virginia park in 2001.Robert Hanssen pleaded guilty to espionage charges in 2001 in return for the government not seeking the death penalty. Hanssen began spying for the Soviet Union in 1979, three years after going to work for the FBI and prosecutors said he collected $1.4 million for the information he turned over to the Cold War enemy. In 1981, Hanssen's wife caught him with classified documents and convinced him to stop spying, but he started passing secrets to the Soviets again four years later. In 1991, he broke off relations with the KGB, but resumed his espionage career in 1999, this time with the Russian Intelligence Service. He was arrested after making a drop in a Virginia park in 2001.

John Walker ran a father and son spy ring, passing classified material to the Soviet Union from 1967 to 1985. Walker was a Navy communication specialist with financial difficulties when he walked into the Soviet Embassy and sold a piece of cyphering equipment. Navy and Defense officials said that Walker enabled the Soviet Union to unscramble military communications and pinpoint the location of U.S. submarines at all times. As part of his plea deal, prosecutors promised leniency for Walker's son Michael Walker, a former Navy seaman.John Walker ran a father and son spy ring, passing classified material to the Soviet Union from 1967 to 1985. Walker was a Navy communication specialist with financial difficulties when he walked into the Soviet Embassy and sold a piece of cyphering equipment. Navy and Defense officials said that Walker enabled the Soviet Union to unscramble military communications and pinpoint the location of U.S. submarines at all times. As part of his plea deal, prosecutors promised leniency for Walker's son Michael Walker, a former Navy seaman.

Army Pvt. Bradley Manning was convicted July 30 of stealing and disseminating 750,000 pages of classified documents and videos to WikiLeaks, and the counts against him included violations of the Espionage Act. He was found guilty of 20 of the 22 charges but acquitted of the most serious charge -- aiding the enemy. Manning was sentenced to 35 years in military prison in 2013.Army Pvt. Bradley Manning was convicted July 30 of stealing and disseminating 750,000 pages of classified documents and videos to WikiLeaks, and the counts against him included violations of the Espionage Act. He was found guilty of 20 of the 22 charges but acquitted of the most serious charge — aiding the enemy. Manning was sentenced to 35 years in military prison in 2013.

Former intelligence contractor Edward Snowden revealed himself as the leaker of details of U.S. government surveillance programs run by the U.S. National Security Agency to track cell phone calls and monitor the e-mail and Internet traffic of virtually all Americans. Snowden has been granted temporary asylum in Russia after initially fleeing to Hong Kong. He has been charged with three felony counts, including violations of the U.S. Espionage Act, over the leaks.Former intelligence contractor Edward Snowden revealed himself as the leaker of details of U.S. government surveillance programs run by the U.S. National Security Agency to track cell phone calls and monitor the e-mail and Internet traffic of virtually all Americans. Snowden has been granted temporary asylum in Russia after initially fleeing to Hong Kong. He has been charged with three felony counts, including violations of the U.S. Espionage Act, over the leaks.

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

Sharing secrets: U.S. intelligence leaks

HIDE CAPTION

Sharing secrets: U.S. intelligence leaksSharing secrets: U.S. intelligence leaks

The Intercept article focuses on the growth in U.S. government databases of known or suspected terrorist names during the Obama administration.

The article cites documents prepared by the National Counterterrorism Center dated August 2013, which is after Snowden left the United States to avoid criminal charges.

Greenwald has suggested there was another leaker. In July, he said on Twitter "it seems clear at this point" that there was another.

Government officials have been investigating to find out that identity.

In a February interview with CNN's Reliable Sources, Greenwald said: "I definitely think it's fair to say that there are people who have been inspired by Edward Snowden's courage and by the great good and virtue that it has achieved."

He added, "I have no doubt there will be other sources inside the government who see extreme wrongdoing who are inspired by Edward Snowden."

It's not yet clear how many documents the new leaker has shared and how much damage it may cause.

So far, the documents shared by the new leaker are labeled "Secret" and "NOFORN," which means it isn't to be shared with foreign government.

That's a lower level of classification than most of the documents leaked by Snowden.

Government officials say he stole 1.7 million classified documents, many of which were labeled "Top Secret," a higher classification for the government's most important secrets.

Big databases

The biggest database, called the Terrorist Identities Datamart Environment, now has 1 million names, a U.S. official confirmed to CNN.

That's boosted from half that many in the aftermath of the botched attempt by the so-called underwear bomber to blow up a U.S.-bound jetliner on Christmas Day in 2009.

The growth of TIDE, and other more specialized terrorist databases and watchlists, was a result of vulnerabilities exposed in the 2009 underwear plot, government officials said.

A year after Snowden

The underwear bomber, Umar Farouk Abdulmuttalab, was not on government watchlists that would have prevented him from being allowed to fly to the United States.

In 2012, the National Counterterrorism Center reported that the TIDE database contained 875,000 names. There were about 500,000 in 2009 before the underwear bomb plot.

The Intercept first reported the new TIDE database numbers, along with details of other databases.

The Intercept article

As of November, 2013, there were 700,000 people listed in the Terrorist Screening Database (TSDB), or the "Terrorist Watchlist, according to a U.S. official. Fewer than 1% are U.S. persons and fewer than 0.5% are U.S. citizens.

The list has grown somewhat since that time, but is nowhere near the 1.5 million figure cited in recent news reports. Current numbers for the TSDB cannot be released at this time.

The Intercept report said, citing the documents, that 40% on the "Terrorist Watchlist" aren't affiliated with terror groups.

U.S. officials familiar with the matter say the claim is incorrect based on a misreading of the documents.

Americans on lists

The report said that as of August, 2013, 5,000 Americans were on the TSD watchlist. Another 15,800 were on the wider TIDE list.

A smaller subset, 16,000 names, including 1,200 belonging to Americans, are listed as "selectees" who are subject to more intensive screening at airports and border crossings.

According to the Intercept, citing the documents, the cities with the most names on the list are: New York, Dearborn, Michigan; Houston; San Diego; and Chicago. Dearborn is home to one the nation's biggest concentrations of Arab and Muslim populations.

According to the documents cited by the Intercept, the government has also begun a new effort to collect information and biometric data on U.S. persons in the aftermath of the 2013 Boston Marathon bombings.

The data includes photos from driver's licenses. That effort likely was spurred by the fact that FBI agents investigating the Boston bombings found existing databases lacking when they tried to match images of the two bombers isolated from surveillance video, according to U.S. officials familiar with the matter.

Stored on Pentagon system

Documents classified as "Secret" are stored on a Pentagon-operated computer system called SIPRNet, which the Defense and State departments use to share classified information.

A recent Government Accountability Office study found that between 2006-2011 there were 3.2 million approved by the Pentagon to handle secret, top secret, SCI (sensitive compartmented) information.

SIPRnet is one of the computer systems that the former Army soldier now known as Chelsea Manning accessed to leak hundreds of thousands documents, including State Department cables.

The Manning leak was the largest U.S. intelligence leak until Snowden.

Obama, Congress working on changes to NSA

Opinion: NSA and your phone records: What should Obama do?

Review board finds potential abuses in NSA phone, internet surveillance