An explosion at a mosque in Indonesia's capital Jakarta during prayers that injured dozens of people could have been an attack, officials indicated, with a 17-year-old identified as the "suspected perpetrator".

The country's deputy house speaker Sufmi Dasco Ahmad, speaking to media after visiting a hospital, said the suspect was currently undergoing surgery.

Jakarta city police chief Asep Edi Suheri told reporters 55 people had been admitted to hospitals with a range of minor to serious injuries, including burns from the blast at the mosque on Friday inside a school complex in the Kelapa Gading area.

Witnesses told local television stations that they heard at least two loud blasts around midday, just as the sermon had started at the mosque at SMA 27, a state high school within a navy co

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