Attacker 'may have self-radicalized'

A Somali immigrant who injured 11 people at Ohio State University in a vehicle and stabbing attack before he was shot dead may have followed the same path to self-radicalization as militants in a number of "lone wolf" attacks, officials said on Tuesday.

Abdul Razak Ali Artan, 20, was shot dead by a police officer on Monday moments after he plowed his car into a crowd of pedestrians and then leapt out and began stabbing people with a butcher knife.

Investigators were probing the background of Artan, a Muslim who was a lawful permanent resident of the United States and a student at Ohio State.