Explosions at a high school mosque in Jakarta, Indonesia, during Friday prayers injured dozens of students

Jakarta, Indonesia — Multiple explosions rocked a mosque at a high school during Friday prayers in Jakarta, Indonesia’s capital, wounding at least 54 people, mostly students, police said.

Witnesses told local television stations that they heard at least two loud explosions around noon, just as the sermon began at the mosque at SMA 27, a state high school inside a naval complex in the Kelapa Gading neighborhood, north of Jakarta. Students and others ran out in panic as gray smoke filled the mosque.

Most of the victims suffered minor or serious injuries from glass fragments. The cause of the explosions was not immediately known, but they occurred near the mosque’s loudspeaker, according to Jakarta police chief Asep Edi Suheri.

People were rushed to nearby hospitals. Some were soon sent home, but 20 students remain hospitalized, three of them with serious injuries, the police chief said.

Suheri said a bomb squad deployed to the scene found toy rifles and a toy gun near the mosque.

“Police are still investigating the scene to determine the cause of the explosions,” Suheri said, urging people not to speculate that the incident was an attack before the police investigation is concluded.

“Let the authorities work first,” Suheri said. “We will convey to the public whatever the results are.”