The Islamic State group says it was behind a car and knife rampage at a US college that left 11 people injured.
Monday’s attack at Ohio State University was carried out by one of its students, Somali-born Abdul Razak Ali Artan, the authorities said.
The IS-affiliated Amaq news agency called the 18-year-old business undergraduate a “soldier”.
Artan drove his car at a group of people, then attacked them with a knife before being shot dead.
Just opportunistic? Analysis by Gordon Corera, BBC Security Correspondent
The IS claim does not prove much in terms of the attack in Ohio. The group often refers to individuals who carry out attacks as its “soldiers”, but the crucial question is firstly whether the individual had any form of direct contact with IS.
Face-to-face contact may be unlikely but online communication is possible. If there was no direct contact, it could still be the case that an individual was inspired rather than directed by the group. In this case, an individual may leave his or her own pledge of allegiance in written form or online or in a video.
But until such evidence emerges, it remains hard to know if this is just an opportunistic claim by the group rather than one based on real substance.
Amaq posted an image of Artan wearing a blue shirt and sitting with greenery in the background, but did not say if the attack was directed from abroad, or if Artan had been self-radicalised.
Most of the victims were injured by Artan’s car, but two were stabbed with a “butcher’s knife” and another suffered a fractured skull, officials said.
One of the wounded victims, William Clark, an Ohio State University professor, described how Artan’s vehicle had crashed into a large concrete planter before bouncing off and striking him.