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A suspect is dead and at least nine injured after a rampage at Ohio State University.
A federal law enforcement official told CNN that there was one attacker, who mainly used a knife and a car in the attack - countering earlier reports that there was an active shooter.
But exactly what happened at the campus remains unclear since the Columbus Post-Dispatch is reporting that there were two attackers - one armed with a gun, and the other with a knife.
The chaos started around 10am, when a fire alarm was pulled at Watts Hall, home to the Materials Science and Engineering program.
Witnesses say that as they were evacuating the building when a man driving a car mowed down the crowds of innocent bystanders.
The attacker then reportedly got out of the car and started stabbing and slashing victims. The witness said that the knifeman didn't say anything throughout the attack but had a 'crazed' look on his face. A responding officer shot the suspect dead.
After the incident at Watts Hall, the law enforcement focus shifted to a nearby parking garage.
SWAT teams stormed the building just before 11am and minutes later two men, one black and one white, were led out in handcuffs.
Just after 11:30am, the university lifted the shelter in place, but cancelled classes for the rest of the day.