Berlin (CNN) A manhunt is underway for a 24-year-old Tunisia native in connection with this week's Christmas market attack in Berlin -- a man German authorities say may be "violent and armed" and had been in contact with radical Islamist groups. Anis Amri is being sought in Monday's truck attack, which left 12 people dead and 48 injured at Breitsheidplatz, a wanted notice issued Wednesday by the German federal prosecutor's office said. Police have offered a reward of up to 100,000 euros (about $104,000) for information about his whereabouts, and said Amri is "under urgent suspicion." "If you see this person that we are seeking, inform the police. Please do not put yourself in danger because this person could be violent and armed!" the notice said.Anis Amri is being sought in deadly truck attack on Berlin Christmas marketSuspect was held in August and let go, German security official tells CNN
The suspect also came onto the radar of _ police because he was looking for a gun, the official said. _ authorities have not publicly named any of the victims, and police have asked people not to post videos or photos of them as a sign of respect.