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On Monday, police shot and killed a 17-year-old Afghan migrant armed with an axe and knife after he attacked train passengers in southern Germany, the Associated Press reports. Four people are said to be in serious condition, but the total number of injured is not yet clear.

According to The New York Times, the teen migrant applied for asylum in Germany after arriving alone last year. From CNN:

The attack took place as the train was traveling between stations. The train made an emergency stop short of the station at Wurzburg-Heidingsfeld and the assailant jumped out of the train, [regional police spokesman Lt. Fabian] Hench said.

Police hunted the man down with ground searchers and a helicopter, and he was killed, Hench said.

The attacker’s motive is not currently known, but investigators are reportedly looking into witness accounts that the teen yelled “an exclamation” during the attack.