The German authorities claim to have found a video in which the suspected Ansbach bomber pledges allegiance to ISIL militants.
The images were reportedly found on the suspect’s mobile phone. The jihadists earlier claimed responsibility for the bombing in which the suspect died and 15 others were wounded.
The Bavarian Interior Minister Joachim Herrmann has warned such attacks could happen anywhere.
“We must be prepared. Everyone now feels that we are in a situation where attacks like those in Brussels cannot be ruled out in Germany, whether here in Bavaria or in North Rhine-Westphalia or in Berlin. We must be appropriately equipped for such situations.”
The bomber has been identified as a 27-year-old Syrian asylum seeker who was facing deportation to Bulgaria. On searching his room police say they found the same materials as used in his backpack bomb.
Police are searching for possible accomplices.
The incident, after three other attacks since July 18 that have left 10 people dead and dozens injured, has fueled growing public unease about Chancellor Angela Merkel’s open-door refugee policy. More than a million migrants entered Germany over the past year, many fleeing war in Afghanistan, Syria and Iraq.