Story highlights German authorities investigating video released by ISIS media group

ISIS-like flag found in assailant's apartment.

Attacker was a 17-year-old Afghan man living in Germany, official says

Police shot and killed attacker; five passengers wounded, two in serious condition

Berlin (CNN) ISIS has claimed responsibility for a brazen attack on a train in southern Germany late Monday evening which left five people wounded, two of them seriously. German authorities are investigating that claim.

The assailant, armed with a knife and an ax, was shot dead by police after a chase and confrontation, Bavarian Interior Minister Joachim Herrmann said at a news conference early Tuesday.

He identified the attacker as a 17-year-old Afghan man living in Ochsenfurt, Bavaria. The teen came to Germany as an unaccompanied minor a year ago, Herrmann said. He was taken in by a foster family two weeks ago, he said.

A hand-drawn flag resembling the one used by ISIS was found in the room of the Afghan man, Herrmann said.

"The first emergency call that the police headquarters received was about a witness who said that the attacker carried out attacks causing serious injuries and he had called out Allahu Akbar," Herrmann said.

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