Three people including the nephew of the Berlin Christmas market attacker Anis Amri have been arrested in Tunisia.
Tunisia's Interior Ministry said Amri - who was shot dead on Friday - had sent his 18-year-old nephew Fedi money to join him in Europe.
Twelve people were killed and dozens more injured in the attack on Monday.
Anis Amri, the main suspect behind the Berlin Christmas market attack, was seen on CCTV leaving a mosque - hours after killing 12 people.
The still image was captured from a surveillance camera in the city centre at 3.49am on December 20.
ITV News Security Editor Rohit Kachroo said it captures the start of Amri's trip across Europe.
He said it was "not a secretive escape, but a brazen journey."
The funeral for the lorry driver killed in the Berlin Christmas market attack has taken place in his home country of Poland.
Footage has emerged of the final moment before a truck ploughed into a crowd of people at a Christmas market in Berlin.
A man is being hunted by German police after a lorry ploughed into a Berlin Christmas market on Monday, killing 12, but who is the suspect?