Germans should be prepared for further attacks by small groups and individuals, a minister says, after a teenager wounded five people on a train.
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.
Source: German train stabbing: De Maiziere warns of lone attacks – BBC News
