German police has launched a manhunt for a rejected asylum seeker suspected to be involved in a deadly truck assault on a Berlin Christmas market claimed by the Islamic State terror group. <br/><br/>Officials said, the suspect, 24-year-old Tunisian national Anis Amri, had already been under investigation for planning an attack. Asylum office papers belonging to Amri were found in the lorry used in the attack that killed 12 people.<br/><br/>Prosecutors have released two photos of the suspect and offering a reward of one lakh euros for information leading to the arrest of Amri having links to the radical Islamists. <br/><br/>Twelve people were killed when the Polish-registered truck, laden with steel beams, slammed into the crowded holiday market late Monday, smashing wooden stalls and crushing victims. Twenty-four people remain in hospital, 14 of whom were seriously injured.<br/>'''''