KABUL (Pajhwok): An explosion during Friday prayers at a mosque inside a school in Indonesia's capital Jakarta injured 54 people, the city's police chief said.

“The initial data we have received indicates that there are approximately 54 individuals affected. Some have minor injuries, some moderate, and some have already been discharged,” Asep Edi Suheri said, without disclosing the cause of the explosion.

The cause of the explosion was being investigated, the police official said in a televised press conference.

However, initial inspections suggest investigators are considering several possibilities, including an electrical short circuit, a malfunctioning electronic device, or a homemade explosive.

The explosions occurred in North Jakarta's State Senior High School 72 (SMA Negeri 72) around 12:30 pm (0530GMT), the Jakarta Globe reported, citing police.

Local media showed footage of a special police unit standing by at the school.

Media outlets reported injuries to several people, with varying numbers, and said some had been taken to hospital.

A bomb squad carried out a thorough inspection of the area following the incident.

Most of the victims sustained minor, non-life-threatening injuries caused by glass fragments and the impact of the blast's shockwaves.

News channels KompasTV and MetroTV showed footage of a police line around the school with ambulances standing by.

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