[Will.]

The shooting reportedly began around 10:00 local time near Watts Hall, the college's materials science and engineering building.

"The first thing I heard were screams," student Cydney Ireland told ABC News.

"Probably five seconds after that there were three gunshots and it sounded like a handgun.

"And I've never seen anything like it. Everybody was running in any direction they possibly could."

According to the school newspaper, The Lantern, police have surrounded the Lane Avenue parking garage, where an officer at the scene said a suspected shooter was believed to be inside.

A bomb squad was also at the scene, the newspaper reported.

"Ohio's thoughts and prayers go out to the Ohio State community," Ohio Governor John Kasich tweeted.

"Be safe, listen to first responders", he added.