At least one person was killed and six others were injured Oct. 25 when gunfire erupted during late-night homecoming festivities at Lincoln University, a historically Black college in Pennsylvania.

The shooting occurred just before 9:30 p.m. in the parking lot of the university’s International Cultural Center, where students and alumni gathered for a tailgate after a football game earlier in the day.

“It was a chaotic scene, and people were running everywhere,” Chester County District Attorney Chris de Barrena-Sarobe said during a 1:00 a.m. press conference, describing a joyous scene interrupted by violence. The university is located approximately 30 miles southeast of Lancaster, Pennsylvania.

Police detained one armed suspect and are investigating the possibility that others were involved in the shooting. The district attorney did not immediately provide details about the suspect in custody.

“We’re operating as if this is not an incident where someone came in with the design to inflict mass damage on a college campus,” he said.