Trump denounces attack, vows tough immigration plan

German authorities were under fire on 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 extremist.

German prosecutors have issued a Europe-wide wanted notice for 24-year-old Anis Amri, offering a $104,000 reward for information leading to his arrest and warning he "could be violent and armed".