Passengers were seen leaving Stockholm's main train station after a truck drove into a crowd on a shopping street and crashed into a department store in central Stockholm on Friday (April 7), killing three people and wounding eight in what the prime minister said appeared to be a terrorist attack.
Part of central Stockholm was cordoned off and the area was evacuated, and policemen armed with machine pistols were deployed.
All subway traffic was halted on orders from the police.
Many police and emergency services personnel were at the scene, a Reuters witness said.
Nobody has been arrested in connection with the attack police said. There was no immediate claim of responsibilty.
Several attacks in which trucks or cars have driven into crowds have taken place in Europe in the past year. Al Qaeda in 2010 urged its followers to use trucks as a weapon.
In London on March 22, a man in a car ploughed into pedestrians on Westminster Bridge, killing four, and then stabbed a policeman to death before being shot by police.
Islamic State claimed responsibility for both an attack in Nice, France, last July, when a truck killed 86 people celebrating Bastille Day, and one in Berlin in December, when a truck smashed through a Christmas market, killing 12 people.