A suspect in a shooting at a Dallas high school that wounded four students and drew a heavy police response to the campus has been taken into custody.

Axar.az reports, citing AP, three of the students were injured by gunfire and the fourth was injured in their lower body, according to the Dallas Fire-Rescue Department.

The department said units were dispatched to Wilmer-Hutchins High School just after 1 p.m. and that the four students, all of whom are male, were taken to hospitals with injuries ranging from serious to not life-threatening.

The school district said in a statement Tuesday night that a suspect was apprehended within hours of the shooting, but didn’t provide details about the person or say whether they had been arrested.

Christina Smith, assistant police chief for the Dallas Independent School District, said at the earlier news conference that the investigation was fluid and she did not have any information on what led to the shooting.

The three who were shot were between the ages of 15 and 18, while the age of a person with a “musculoskeletal injury” was not known, Dallas Fire-Rescue said.

School district officials and police gave few details during the news conference held several hours after the shooting, which drew a large number of police and other law enforcement agents to the roughly 1,000-student campus.

Smith said that the gun didn’t come into the school during “regular intake time.” She said “it was not a failure of our staff, of our protocols, or of the machinery that we have.” But she said she could not elaborate on that.

Texas Gov. Greg Abbott said in a statement that “our hearts go out to the victims of this senseless act of violence.”