(CNN)At least two people were killed when a truck was driven into pedestrians on the busiest street in the center of Stockholm, in what appeared to be the latest use of a vehicle as a weapon of terror in Europe.
The Swedish Security Service said a large number of people were injured in the attack, which happened just before 3 p.m. local time on Friday. People were seen fleeing the area in panic.
Local media reported that the truck was hijacked as it made a delivery nearby. Eyewitnesses reported it being driven at speed along Drottninggatan (Queen Street) before it crashed into the front of a department store.
Security services said the driver of the truck was not in custody and a manhunt was underway. Police urged people to stay at home and avoid the city center.
Parliament and the Stockholm subway were placed in lockdown. All train services in and out of Stockholm Central Station were halted and people were evacuated, the Swedish state railway company said.
“Sweden has been attacked,” Swedish Prime Minister Stefan Lofven told reporters “Everything indicates this is a terror attack.”
Video shows scene after Sweden attack
Video shows scene after Sweden attack 00:47
Lofven said the government was doing everything possible to help the security services. “We are thinking about the victims — their families and friends — and those who were injured,” he said.”
The Prime Minister was returning to the capital from the west of the country, his spokesman Erik Nises told CNN.
King Carl XVI Gustaf also announced he had cut short his state visit to Brazil to return home immediately in the aftermath of the attack.
Anders Thornberg, Director General of the Swedish Security Service, said a “person of interest” was being investigated by police.
‘He put his foot on the gas’
According to eyewitness Veronica Durango, the driver “put his foot on the gas and ran through the crowd.”
“He came from Olof Palmes Street and drove down to Drottninggatan,” Durango told CNN in a phone interview.
“It was like he was driving through paper. It’s like it was nothing. I can’t even believe how a person could do such a thing. And then he just kept on going. I was in shock.”
The Spendrups Brewery truck was stolen while making a delivery to a restaurant further up Drottninggatan, Reuters quoted company spokesman Marten Lyth as saying. A masked person jumped into the cab, started the truck and drove away, he said.
Security services launched an investigation into whether more than one people were involved in carrying out the attack.
“Plenty of people have been injured and some have died in the attack that just hit Stockholm,” said Nina Odermalm Schei, head of press for the security service.
“We are still trying to determine who the attacker was, if the attack was carried by one or more people, and the number of injured.”