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.
Members of Berlin's Muslim Ahmadi community have sent out a message at the city's vigil for victims of the Christmas market attack, wearing t-shirts reading: "Love for all, hate for none."
Good Morning Britain's Chief Correspondent Richard Gaisford tweeted an image of a group of men with the slogan emblazoned on their tops.
The so-called Islamic State earlier claimed responsibility for the killings as the hunt continues for the perpetrator of the attack.
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?