A man arrested in Stockholm after Friday’s fatal lorry attack is believed to be the driver, Swedish police say.
The man, who was arrested in the north of the city, has not been named, but Swedish media say he is from Uzbekistan.
Four people were killed and 15 were injured when the lorry crashed into the front of a department store.
Police said they were unable to confirm local television reports of explosives being found inside the truck.
The lorry – hijacked from outside a nearby restaurant – crashed into the front of Ahlens department store in the middle of the afternoon on Drottninggatan (Queen Street), one of the city’s main pedestrian thoroughfares.
Eyewitnesses described horrifying scenes outside the store, as bodies and injured people lay on the ground.
Swedish Prime Minister Stefan Lofven has called it a terrorist attack, with borders tightened at his request.
The suspect was detained on Friday evening after police released a grainy security camera image of a person of interest dressed in a hooded jacket. A second arrest was reportedly made later.