This is a breaking news story. Check back for updates.

UPDATE 4:39 p.m. EST: WPXI is reporting that a second suspect is in custody.

UPDATE 4:35 p.m. EST: One suspect is in custody, according to CBS Pittsburgh.

UPDATE 4:18 p.m. EST: The victims are not cooperate with police on their investigation into the shooting, which may have been in retaliation for an incident at the school that occurred last month, WPXI breaking news reporter Dave Bondy tweeted.

UPDATE 4:10 p.m. EST: One of the victims has been identified as a 17-year-old boy who was grazed in the head by a bullet, according to CBS Pittsburgh. He's in stable condition.

UPDATE 4:04 p.m. EST: WTAE is reporting that the students were shot while walking to a car they were riding in earlier in the day. All of the victims were taken to the hospital with non-life-threatening injuries.

UPDATE 3:53 p.m. EST: The three victims have been identified as Brashear High School students. All of the victims were shot outside the school.

UPDATE 3:46 p.m. EST: According to Pittsburgh police, the three suspects emerged from nearby woods and shot at Brashear High School, @PzFeed reported. All of the suspects were wearing black.

UPDATE 3:33 p.m. EST: One of the victims was shot inside Brashear High School, and the other two victimes were shot outside of the Pittsburgh school, according to @PzFeed. The suspects are still at large.

Original story:

At least three people were shot at Brashear High School in Pittsburgh Wednesday afternoon, according to CBS affiliate KDKA.

Dispatchers with Pittsburgh police said they received reports of at least three people shot, the station reported. It was unclear if the victims were students.

Pittsburgh ABC affiliate WTAE reports that police are looking for a suspect dressed in all black clothes who was seen leaving the school and heading toward a wooded area. 

The Twitter breaking news account @PzFeed reported that police are looking for three shooters.