The man is in his early 20s and apparently has used various identities, said Stephan Mayer, a senior lawmaker with Germanys governing conservatives. He said the man was considered part of the Salafist-Islamist scene by authorities.
Germanys chief federal prosecutor told lawmakers that this Tunisian is a solid lead, his wallet was found in the cab of the truck, but that its not clear that he was also the perpetrator, said Burkhard Lischka of the Social Democrats, the junior governing party.
The new suspect apparently arrived in Germany in July 2015 and lived in three German regions since February, mostly in Berlin, said Ralf Jaeger, the interior minister of western North Rhine-Westphalia state.
Jaeger told reporters on Wednesday that state police had launched proceedings against the man on suspicion that he was preparing a serious crime. He said security agencies exchanged information about this person in the joint counter-terrorism centre, the last time in November.
Separately, the mans asylum application was rejected in July. German authorities prepared to deport him but werent able to do so because he didnt have valid identity papers, Jaeger said. In August they started trying to get him a replacement passport.
Tunisia at first denied that this person was its citizen, and the papers werent issued for a long time, Jaeger said. They arrived today.