A 19-year-old convicted killer serving three life sentences for shooting up an Ohio high school escaped from prison Thursday night, authorities say.

T.J. Lane reportedly escaped with two other inmates on Thursday night around 8 pm.

Lane was serving three life sentences for killing three teenagers during a 2012 school shooting in Ohio. The then-17-year old wore a t-shirt that said "Killer" to his sentencing and reportedly smiled and laughed through most of his trial

According to the AP, authorities quickly captured one of the escapees outside the Lima, OH prison. But Lane and another inmate, 45-year-old Clifford E. Opperud are still at large.

Opperud was serving time for aggravated robbery, burglary, and kidnapping.

A manhunt is underway and police say the pair should be considered dangerous but are probably not armed.

Update, 09/12, 7:58 a.m.: Lane was captured early this morning, the Associated Press reports. Opperud is still at large.

[image via Lima Police]