Ohio State University attack claimed by IS
The Islamic State group has claimed responsibility for an attack at Ohio State University in which a man ran down pedestrians in a car and stabbed others with a butcher's knife.
The attacker, a Somali immigrant student at the university, injured 11 people in Monday's attack before he was shot dead by a police officer.
The Islamic State news agency AMAQ posted a photo of Abdul Razak Ali Artan wearing a blue shirt and sitting with greenery in the background. It described him as a soldier of the group.
"Brother Abdul Razak Ali Artan, God accept him, implementer of the Ohio attack, a student in his third year in university," the caption read.
Artan, born in Somalia, was a US permanent resident who arrived in the country in 2014, said a federal official, who asked not to be identified.
Investigators believe Artan may have lived for as long as seven years in Pakistan, said the federal official, who also declined to be named because of the investigation. Somali refugees often spend some time in Pakistan before coming to the United States, another official said.
Members of Columbus' Somali community have denounced the attack.
The claim comes as US officials questioned whether Artan may have followed the same path to self-radicalisation as militants in a number of "lone wolf" attacks.
So far, investigators have found no strong evidence linking Artan to other known militant individuals, cells or groups, said two federal law enforcement officials who declined to be named because the probe is ongoing.
Artan's actions fit the pattern of so-called "lone wolf" militants who carried out attacks in the United States, such as the gunman who shot to death 49 people at a nightclub in Orlando, Florida, in June, and the man who killed four US Marines and a Navy sailor in a shooting in Chattanooga, Tennessee, last year, the officials said.
The gunman in those two attacks were Muslim, as was Artan, and were killed by police.
Investigators were looking into a message believed to have been posted on Facebook by Artan that contained inflammatory statements about being "sick and tired" of seeing Muslims killed and reaching a "boiling point", a law enforcement source said.
None of the victims have life-threatening injuries, officials said. Seven people have been released.