A second man was arrested late Friday afternoon in an alleged plot to conduct a mass shooting earlier this week at a high school graduation in Pontiac.

The Oakland County Sheriff’s Office says it arrested Jamarion Jaryante Hardiman, 20, within hours of identifying him as a suspect.

A 19-year-old suspect, who has not been identified, was arrested Wednesday.

Deputies were called to the Arts and Technology Academy graduation Tuesday at United Wholesale Mortgage’s sports complex on a report of a fight. While they were there, someone told them about a post they had seen on Snapchat threatening to shoot up the ceremony.

As UWM security looked into the people involved in the fight, which included the two men now in custody, they realized the men were on camera putting packages underneath cars, Sheriff Michael Bouchard said.

One of the packages contained a pink AR-style pistol with a 40-round magazine and the other was a black handgun with a 40-round stick magazine.

According to the venue, about 1,350 people had registered to attend the ceremony.

“I am very proud of the swift teamwork of our deputies and the security of the sports complex that I believe averted a potential mass shooting,” Sheriff Michael Bouchard said. “The nearly 80 rounds the suspects possessed being fired into a graduation is too terrible to imagine and thankfully was prevented.

“These two individuals already have been involved with the criminal justice system for weapons offenses, and they need to be held fully accountable. We cannot accept individuals that carry and use firearms illegally. The message must be clear: if you do this, you will serve real time.”

The guns were unregistered, and police are still trying to track the owners, Bouchard said.

Septembra Williams, superintendent of the Arts and Technology Academy of Pontiac, said the June 3 ceremony was only disrupted for two minutes, but otherwise it went off without a hitch.

“The goal was to make sure the students weren’t infringed upon based on the incident outside,” Williams said.

The school did not know about the threat prior to the graduation, Williams said.

Bouchard said Hardiman is on probation for a previous weapons case in Oakland County.

He urged community members to contact them if they see any threats or suspicious activity. It may save lives, he said. They didn’t hear about this threat until they were at UWM for the fight, he said.

Neither of the suspects were students at the school. Bouchard said he did not believe either man had gone to the school, but did have friends and relatives there and had ongoing disputes with people in the community.

“So many people are quick to (choose) violence these days,” Bouchard said. “For whatever reason, they think this is the solution. … People have interpersonal disputes and instead of talking them out or figuring them out, or even in the old days having a fist fight about it, it escalates to weapons.”