Dozens of people have been injured in an explosion in Indonesia's capital, Jakarta.
The blast occurred during Friday prayers at a mosque inside a school complex, police said.
Officers are investigating the cause of the explosion in Kelapa Gading, North Jakarta, the city's police chief told a televised press conference.
Fifty-four people have been admitted to hospitals for treatment, he said. Their injuries range from minor to serious, and include burns.
Local news channels showed footage of a police line around the school with ambulances standing by. Images of the mosque did not show extensive damage.
