Driver named as 30-year-old Iraqi who shouted Allahu akbar and claimed to have a bomb.
Six people were injured in a suspected terror attack in Berlin on Tuesday night when a driver deliberately rammed a series of motorcycles on a busy city motorway.
One of the victims had to be resuscitated on the scene and three suffered serious injuries.
Police are investigating whether it was a terror attack. According to a spokesmen for Berlin prosecutors, the 30-year-old driver is in custody and his initial statements under interrogation suggest the attack was religiously motivated.
He has not been officially named, but German media have identified him as Sarmad A, an Iraqi national.
Witnesses described him emerging from his car and shouting Allahu akbar after he knocked down two motorcyclists on the A100 motorway, which runs through central Berlin.
He then put a metal box on the roof of his car and said: No one come closer, or you will all die.
Bomb disposal officers later examined the object and found it was an empty ammunition box containing harmless tools.
The incident began at around 6.30pm on Tuesday evening, when a black Opel collided with a scooter near the Innsbrucker Platz junction in south Berlin.
The scooter driver had to be resuscitated and the Opel driver fled the scene. At this point there was no indication it was a deliberate attack.
The same car was later involved in a second collision with a motorbike further west along the motorway.
The driver then appears to have changed direction. The third incident took place to the east, near the Alboinstrasse junction, where the driver rammed two motorcyclists before emerging from his car and threatening onlookers with the box.
Police were able to overpower the driver at the scene. The motorway was closed in both directions for several hours, and around 300 cars were caught in tailbacks.