The man accused of killing two people in a mass shooting at an Ohio warehouse Tuesday night said in court Thursday he did not resist arrest and was ordered held on a $20 million bond.

A warehouse worker said in a frantic 911 call that he was shot in the neck and then took the gun from a co-worker after he had shot several others. Two people died and four were injured in the Ohio shooting that sent panicked employees fleeing.

Officials say they are investigating why a gunman shot six people, killing one of them, at a business in New Albany, Ohio, late Tuesday