A Syrian asylum seeker who blew himself up in the southern German town of Ansbach on Sunday was influenced by an unknown person in a chat conversation on his mobile phone, Bavaria's Interior Minister Joachim Herrmann said on Wednesday.
"It's possible to deduce that another person wherever they were at the time of the call, of the chat, significantly influenced how the attacker acted," Herrmann said on the sidelines of a meeting of the Bavarian cabinet.
"The chat ended directly before the attack," he added.
Officials say the bombing by the 27-year-old Syrian, who had arrived in Germany two years ago, was clearly a terrorist attack, citing a video found on his mobile phone in which he talks of planning an "act of revenge" against Germans.
The man set off explosives in his rucksack on Sunday outside a musical festival in Ansbach, a town of 40,000 people southwest of Nuremberg, killing himself and injuring 15 people.
Police are trying to find out whether the attacker had help in making the bomb and whether it exploded prematurely, which could suggest he wanted to kill as many people as possible.
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