The fingerprints of a Tunisian migrant wanted for questioning by police have been found inside the truck that killed 12 people when it smashed through a Berlin Christmas market.
A Europe-wide manhunt is underway for Anis Amri, 24, following the attack, which is the worst on German soil since 1980.
The Islamic State has claimed responsibility for the incident, in which the truck ploughed through a crowd of people at a busy Christmas market.
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One of the victims, the driver of the truck, was stabbed and shot when his vehicle was hijacked.
His body was found in the back of the truck.
Amri was previously identified by security as a potential threat and had his asylum visa revoked, but authorities were yet to deport him because his identity documents were missing.
His documents were found in the truck by police following the attack.
Police arrested four people who had been in contact with Amri in the western city of Dortmund, according to media reports which police will not comment on.
The incident has heightened security concerns across Europe in the lead up to Christmas.