University attacker 'drove car into crowd before stabbing people'
A man ploughed his car into a group of pedestrians at Ohio State University and then began stabbing people with a butcher knife before he was shot and killed by an officer, campus police said.
Nine people were injured, one critically, and Columbus Police Chief Kim Jacobs said police were looking into whether it was a terrorist attack.
Buckeye Alert: Continue to shelter in place. Wait for Police officers directions. Please contact Police / 9-1-1 only if you have information— OSU Emergency Mngmnt (@OSU_EMFP) November 28, 2016
The details emerged after a morning of confusion and conflicting reports that began with the university issuing a series of tweets warning students that there was an "active shooter" on campus near the engineering building and that they should "run, hide, fight".
Numerous police vehicles and ambulances converged on the 60,000-student campus, and authorities blocked off roads.
Ohio State Police Chief Craig Stone said the attacker drove over a kerb outside a classroom building and an officer who was nearby shot the driver.
"The threat ended when the officer shot the suspect," said Monica Moll, the school's public safety director.
The "shelter-in-place" warning was lifted about an hour and a half later and the campus was declared secure after police concluded there was no second attacker, as rumoured.
At least two people were being treated for stab wounds, four were injured by the car and two others were being treated for cuts, university officials said.
Rachel LeMaster, who works in the engineering college, said a fire alarm sounded before the attack.
"There were several moments of chaos," she said. "We barricaded ourselves like we're supposed to since it was right outside our door and just hunkered down."
Ms LeMaster said she and others were eventually led outside the building and she saw a body on the ground.
Cassidie Baker, an Ohio State senior, said she saw police or paramedics helping one person on the ground outside Watts Hall, a materials science and engineering building.
"No one really knows what is happening, other than there's an active shooter," she said.
Classes were cancelled for the rest of the day.
The initial tweet from the university's emergency management department went out at around 10am and said: "Buckeye Alert: Active Shooter on campus. Run Hide Fight. Watts Hall. 19th and College."
"Run, hide, fight" is standard protocol for active shooter situations. It means: Run, evacuate if possible; hide, get silently out of view; or fight, as a last resort, take action to disrupt or incapacitate the shooter if your life is in imminent danger.