Ax-and-knife attack on train revives debate over refugees

A bloody rampage by an ax-and-knife wielding Afghan refugee has revived concerns in Germany about the country's ability to cope with an influx of migrants over the past year, some of whom may harbor violent hatred toward the west.

Riaz Khan Ahmadzai, 17, attacked tourists from Hong Kong while traveling on a commuter train near the Bavarian town of Wuerzburg on Monday night, wounding four on board and a local German dog walker outside as he fled. Two of them remained in critical condition Thursday.

The Islamic State group claimed responsibility for the attack and posted a video in which the teen waved a knife and referred to himself as a "soldier of the Islamic State". Authorities, however, have said that the attacker, who was shot and killed after lunging at police with his weapons, likely acted alone after becoming radicalized.