Indonesian authorities said Saturday they were investigating a student over their alleged involvement in explosions that wounded nearly 100 people at a school in the capital Jakarta.

The blasts hit a school mosque in North Jakarta just as people were gathering for Friday prayers, sparking panic among worshippers.

The national police chief said investigators had gathered “several pieces of evidence” as part of their probe.

“There’s writing, and there is also evidence of powder that could potentially have caused an explosion,” Listyo Sigit Prabowo said in comments broadcast by Kompas TV.

Authorities so far have identified one suspect, a student who was wounded in the explosions, but Listyo did not rule out the involvement of others.

Investigators are also examining the suspect’s family

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