A 17-year-old boy has been identified as the suspected perpetrator of an attack that shook a mosque at a high school during prayers in Jakarta, as police investigate a possible bullying motive.

The incident injured at least 54 people, mostly students.

Witnesses told local television stations that they heard at least two loud blasts around midday on Friday, just as the sermon had started, from inside and outside the mosque at SMA 72, an Indonesian state high school.

Students and others ran out in panic as grey smoke filled the mosque.

Police said they had recovered a toy submachine gun belonging to the suspect and inscribed with what appeared to be white supremacist slogans.

However, they brushed away speculation that the blasts were a terror attack.

"The suspect is a 17-year-old male

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