British police say a man who stabbed six people in London’s Russell Square was a Norwegian of Somali origin, but they have found no signs of “radicalisation”.
Assistant Commissioner Mark Rowley said on Thursday the investigation “increasingly points to mental health issues” as the possible cause of the attack.
“We believe this was a spontaneous attack and that the victims were selected at random,” he said.
“So far we have found no evidence of radicalisation that would suggest that the man in our custody is in any way motivated by terrorism.”
The 19-year-old man was arrested on suspicion of murder following Wednesday’s attack in the city centre, which was cordoned off by police.
Russell Square is a busy tourist area with a string of high-end hotels and is also close to the British Museum and the University of London.
Rowley said one person was killed in the attack – an American woman.
The five injured people are British, American, Israeli and Australian. None has life-threatening injuries.
The American victim, believed to be in her 60s, was treated by paramedics at the scene but pronounced dead.
“Two people who were injured in the Russell Square incident remain in hospital. Three others have been discharged,” police said on Twitter.
The arrested man is in police custody after initially receiving treatment at hospital.
Police were called to Russell Square at 10:33pm local time (21:33 GMT) on Wednesday following reports a man armed with a knife was attacking people.
The man was arrested six minutes later, with one of the officers firing a Taser electroshock gun.