4 killed as truck crashes into crowd in Stockholm

A truck rammed into people on a central Stockholm street before crashing into a department store on Friday, with police and witnesses saying four people had died and eight others injured in the incident.

"Sweden has been attacked. Everything indicates that this is a terror attack," Swedish Prime Minister Stefan Lofven told a press conference.

Police have urged people to stay indoors, the SVT news reported, adding that the Parliament building, the Riksdag, has been cordoned off.

All metro services in the Swedish capital city have been suspended following the incident, Radio Sweden reported.

The truck involved in the incident was hijacked earlier on Friday from outside a restaurant in central Stockholm, according to Radio Sweden.

According to witnesses and sources, a man has been taken into custody by police at Olof Palme street a short distance from where the truck drove into the store Ahlens on Drottninggatan street in central Stockholm, Aftonbladet reported.

"It is one of our distribution vehicles running deliveries. Someone jumped into the driver's cabin and drove away with the car while the driver was unloading," the SVT reported, quoting sources.

An attack on any of the European Union (EU) member states is an attack on the bloc all, said European Commission President Jean-Claude Juncker following the Stockholm attack.

Extending condolences to the families of the victims, Juncker said, "We stand shoulder to shoulder in solidarity with the people of Sweden and the Swedish authorities can count on the European Commission to support them in any which way we can."

Danish Prime Minister Lars Loekke Rasmussen said on his Twitter account that he was "horrified by the terrible accident."

Rasmussen sent his message of condolence to his counterpart, Swedish Prime Minister Stefan Lofven, said: "My thoughts are with our Swedish brothers and sisters."

"Our thoughts go to the people of Stockholm...," German government spokesman Steffen Seibert said on social media after the incident, adding, "We stand together against terror."