All three suspects in the armed robbery of four Georgia State University students at a campus dorm are in custody, school officials said Thursday morning.

GSU police Deputy Chief Carlton Mullis identified the suspects as Quinton Arnold, 18, Dantevious Devall Patrick, 18, and Dorian Demetrius Stroud, 18. Police previously said Stroud was 19.

Arnold is a current GSU student, and Stroud is a former GSU student last enrolled in the fall of 2012. Patrick has no affiliation with GSU, according to school spokeswoman Andrea Jones.

The robbery happened shortly after 7 p.m. Wednesday in Building C at University Commons, a 2,000-student housing complex on Piedmont Avenue.

The suspects knocked on the door and two of the suspects pointed a hand gun in the students’ faces before robbing them of an iPad and cell phones, police said in a campus crime alert.

The trio of suspects then left through a stairwell, according to police. No injuries were reported.

Mullis said that one of the victims recognized Arnold, who lives in Piedmont North, another university housing complex. That victim texted Arnold and asked him to meet him outside on Piedmont Avenue. “He did, and we arrested him,” Mullis said.

Police later released a photo of the suspects from security video. Patrick “saw himself on the video and called Atlanta police and turned himself in and APD turned him over to us,” according to Mullis.

He said Stroud’s mother recognized her son from the video photo “and she brought him in to GSU police about 6 a.m.”

A woman who identified herself as Shondra Carter told The Atlanta Journal-Constitution during a phone call Sunday that she did not turn her son in to the police.

“In fact, I had not even seen the news before that time,” she said in a follow-up email.

“Dorian called me to let me know what was being said and wanted to turn himself in and that’s just what he did. I only called the GSU police to let them know he was coming and I drove him to the station.”

When reached for comment, Mullis said he had not spoken with Carter and had no other information to add to her account.

All three suspects were booked into the Fulton County Jail, charged with armed robbery, possession of a firearm during the commission of a crime, aggravated assault and burglary.

Mullis said one of the suspects and at least one of the victims knew one another.

The university’s dormitories are secured by keycard access, but police said the three suspects entered the building earlier in the day using Arnold’s student ID card at the dorm’s security check-in, and that Arnold signed the other two in as his guests.

The last major crime reported on the GSU police website was the July 17 armed robbery of a parking attendant in the school’s “T” parking deck on Auburn Avenue.

Prior to that incident, the last major crimes reported were four robberies and an attempted robbery that occurred on or near campus between October 26 and November 29, 2012.

No injuries were reported in any of those robberies.