PROVIDENCE, R.I. (AP) — A person of interest was in custody Sunday after a shooting during final exams at Brown University that killed two students and wounded nine others, though key questions remained unanswered nearly 24 hours after the attack.

The attack Saturday afternoon set off hours of chaos across the Ivy League campus and surrounding Providence neighborhoods as hundreds of officers searched for the shooter and urged students and staff to shelter in place. The lockdown, which stretched into the night, was lifted early Sunday, but authorities had not yet released information about a potential motive.

Col. Oscar Perez, the Providence police chief, said Sunday afternoon that the person in custody was in their 20s and that no one has been charged yet. Perez, who previously said the person was in their 30s and that no one else was being sought, declined to say whether the detained person had any connection to Brown.

The person was taken into custody at a Hampton Inn hotel in Coventry, Rhode Island, about 20 miles (32 kilometers) from Providence, where police officers and FBI agents remained Sunday, blocking off a hallway with crime scene tape as they searched the area.

The shooting occurred during one of the busiest moments of the academic calendar, as final exams were underway. Brown canceled all remaining classes, exams, papers and projects for the semester and told students they could leave campus, underscoring the scale of the disruption and the gravity of the attack.

College President Christina Paxson teared up while describing her conversations with students both on campus and in the hospital.

“They are amazing and they’re supporting each other,” she said at a news conference. “There’s just a lot of gratitude.”