A heroic ROTC student fatally stabbed the crazed gunman who opened fire inside an Old Dominion University classroom, preventing further carnage Thursday, law enforcement sources said.
Shooter Mohamed Bailor Jalloh, 36, gunned down an instructor before the unidentified cadet jumped into action during the frantic scene, according to sources.
Jalloh, who was previously convicted of trying to support ISIS, walked into the classroom and asked if it was an ROTC class, sources told The Post.
When someone told him it was, he began his trail of bloodshed, according to sources.