June 22 (UPI) — Authorities in the Philippines said Monday that two juveniles were in police custody after three students were killed and seven were wounded in a rare school shooting in the Asian nation.

The shooting occurred Monday morning at San Jose National High School in Tacloban City, located in the eastern Visayas region of the Philippines.

The Tacloban City Police Office said in a statement that officers responded to a distress call regarding an active shooting at the school and detained two suspects, identified only as Rod and Nash. Police recovered two firearms, a .38-caliber revolver and a 9mm Glock pistol.

Unverified video of the shooting posted online shows students in a classroom cowering under their desks as gunshot blasts erupt nearby. Students can be heard screaming and crying.

Authorities said officers secured the area and provided assistance to the wounded 10 victims, who were transported to local hospitals for urgent medical attention. Three of the victims were pronounced dead at the hospital, they said.

The Tacloban City Police Office said bullying may have been a motive behind the shooting.

“Further investigation indicates the incident may have stemmed from a personal grudge allegedly rooted in school bullying,” the police department said.

“Authorities are currently conducting a thorough investigation to establish the full circumstances surrounding the case.”

This is a developing story.