People were killed when a truck crashed into department store Ahlens on Drottninggatan, in central Stockholm, Sweden AprilImage copyright Reuters Image caption The lorry crashed into the Ahlens department store in the city's centre

A lorry has smashed into a store in central Stockholm, killing at least three people, Swedish police say.

Several people were also injured in the incident on Drottninggatan (Queen Street), one of the city's major pedestrian streets.

Swedish Prime Minister Stefan Lofven said the country has been attacked and everything indicated that this was an act of terrorism.

One person has been arrested, he added, but gave no details.

The crash happened at the Ahlens department store just before 15:00 local time (13:00 GMT).

Image copyright AFP/ Getty

Image caption Special police forces work at the scene

Shots have also reportedly been fired in another part of the city, says BBC security correspondent Frank Gardner, citing security sources.

It is not clear whether the two incidents are connected.

Image copyright AFP/Getty Images

Image caption Swedish police swarmed the area

Witnesses say the lorry drove into the front window of the Ahlens store.

"There is total confusion. Many people are totally shocked," eyewitness Leif Arnmar told Swedish national broadcaster SVT.

Image caption Images showed the lorry having ploughed into the building

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