German train stabbing: De Maiziere warns of lone attacks

Five people were wounded, two critically, by a 17-year-old who went on the rampage on a train in the southern state of Bavaria on Monday. The attacker, who arrived in Germany in 2015 as an unaccompanied migrant, was shot dead holding an axe and a knife. A video emerged in which he said he was a soldier of so-called Islamic State.