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Law enforcement officers investigate at the University Center at Southeastern Louisiana University in Hammond on Friday, May 20, 2022. Gunfire erupted after Hammond High School's graduation ceremony at the center Thursday night striking three people. (Photo by Brett Duke, | The Times-Picayune | The New Orleans Advocate)

A 15-year-old was arrested this week after authorities said he was involved in a shooting that injured four people during a high school graduation ceremony on Southeastern Louisiana University's campus last month.

The teen, whose name was not released, faces counts of illegally carrying a weapon by a juvenile, illegal possession of a stolen firearm, possession of cocaine, possession of heroin, possession of a Schedule I drug with intent to distribute, and resisting arrest. He was taken into custody Tuesday.

Four people were wounded May 19 when gunfire erupted outside the university’s arena following a graduation ceremony for Hammond High School seniors.

Tangipahoa Schools superintendent Melissa Stilley said the shots were fired as students were filing out of the building to meet relatives and guests.

Authorities arrested Trent Thomas, 20, the day of the shooting. Thomas was fighting with a group of people on university grounds shortly after the ceremony ended when he pulled out a gun and fired at least 10 shots, Hammond Police said.

Three people were injured by gunfire, and one person was injured in the pandemonium that followed as everyone in the crowd tried to escape, police said.

Email Elyse Carmosino at ecarmosino@theadvocate.com.