Police placed Isulan National High School in Sultan Kudarat province under lockdown Wednesday morning after teachers and students reported hearing what appeared to be a gunshot inside the campus.
The Isulan Municipal Police Station imposed the lockdown as authorities carried out safety procedures and checked the school in Barangay Kalawag 1.
According to an initial report from Isulan MPS, teachers and students heard what they believed was a gunshot coming from an unidentified location inside the school at around 10:26 a.m.
Police said the area was under control as authorities continued to determine what happened. Further information was expected as the investigation progressed.