A 19-year-old Youngstown man who was allegedly at the center of an investigation into an altercation that prompted a lockdown on Youngstown State University's campus has pleaded guilty to unrelated charges. 

Robert Allen pleaded guilty to one charge of possession of drugs from a case dating back to April. 

A warrant was issued for Allen back in April when he failed to appear for court, according to court dockets. 

During court on Tuesday, a judge ordered that he should be fined $100. 

Allen was arrested Monday after turning himself into police following a two hours long lockdown of all buildings on YSU's campus. 

According to police, the lockdown was prompted by a fight Monday morning in which the suspect allegedly threatened someone with a gun at Kilcawley Center, then proceeded to show the weapon. 

YSU Police Chief Shawn Varso said during a briefing that the victim was able to get away and call the police. Varso said that the victim was initially uncooperative, but was able to eventually give officers the suspect's name and description. 

Varso said they immediately issued the lockdown alert, dispatching every nearby officer to the campus. 

Investigators from the Youngstown Police Department, the Youngstown State University Police Department, the Mahoning County Sheriff's Office, as well as several local task forces were involved. The Ohio State Highway Patrol reportedly sent two K9 tracking dogs to the area.

Varso said that officers were able to get in contact with Allen's family members, who were able to get Allen on the phone. 

Allen then allegedly offered to go to the YSU Police Department to talk with officers. 

Allen has not been charged in connection with the alleged altercation or the lockdown.