Police have revealed the identity of the terror suspect they believe is responsible for the killing of 12 people after a truck ploughed through a Christmas market.

A massive manhunt is underway after another man, originally thought to be the killer, was released.

The Tunisian attacker, named as Anis A, is suspected to have hijacked a Polish truck around four hours before ploughing into crowds in Berlin.

The Polish driver died at the scene after being shot and stabbed by the hijacker.

Police have launched an investigation in the North Rhine-Westaphalia state of Germany, as it has been revealed Anis was known to German police.

The North Rhine-Westphalia Interior Minister Ralf Jaeger told a news conference today: “Security agencies exchanged their findings and information about this person with the Joint Counter-Terrorism Centre in November 2016”

Anis also used six different names, under three different nationalities, investigators said.