The nephew of the prime suspect in last month's Berlin market attack and three others arrested in Tunisia were not linked to the carnage, a prosecution spokesman said Saturday.

Tunisian suspect Anis Amri smuggled the weapon used in the Berlin Christmas market attack across borders to Italy and used it in the shoot-out in which he was killed, Italian police said Wednesday.

German police Wednesday detained a Tunisian they believe "could have been involved" in the Berlin Christmas market attack, with alleged links to Anis Amri, the suspected assailant shot dead in Italy last week.

Suspected Berlin truck attacker Anis Amri travelled by bus from the Netherlands to France before heading to Italy where police shot him dead, sources close to the investigation said Wednesday.

Tunisia arrested the nephew of the suspected Berlin truck attacker and two other jihadist suspects who are "connected" to the Tunisian assailant Anis Amri, the interior ministry said Saturday.

Nobody comes to Sesto San Giovanni by chance, say the residents of this dreary working-class Milan suburb where police caught up with Berlin market attack suspect Anis Amri.

Germany was hunting for possible accomplices of the suspected Berlin truck attacker on Saturday, a day after he was killed in a shoot-out with Italian police in Milan.

The Tunisian man suspected of carrying out the Berlin truck attack was shot dead by police in Milan Friday, Italian media reported, citing security sources.

A brother of Tunisian Anis Amri, the prime suspect in a deadly truck attack on a Berlin Christmas market, urged him Thursday to surrender to ease pressure on his family.

German authorities came under fire Thursday after it emerged that the prime suspect in Berlin's deadly truck attack, a rejected Tunisian asylum seeker, was known as a potentially dangerous jihadist.