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.
A Tunisian man who was detained in connection with the Berlin truck attack has been released by German police.
The 40-year-old man was released after police determined he wasn't in contact with Anis Amri regarding the attack on a Christmas market in Berlin on 19 December.
Police detained the man on Wednesday in connection with a telephone number saved in Amri's mobile phone.
Amri was being investigated for benefit fraud after claiming, officials have now revealed.
He was suspected of simultaneously claiming benefits in two towns in Germany under different identities.
The investigation was opened in April, but closed in November as Amri's whereabouts were unknown.
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?