The number of students confirmed dead after the collapse of an Islamic school building in Indonesia have risen to 13, the country's disaster mitigation agency says as the search for survivors continues.

The Al Khoziny school in the town of Sidoarjo in East Java province caved in on Monday, cratering upon hundreds of teenage students during afternoon prayer, its foundations unable to support ongoing construction work on its upper floors.

Thirty ambulances were prepared as rescuers continued looking for 50 students - mostly teenage boys from the ages of 13 to 19 - still trapped under the rubble, the disaster mitigation agency said.

Earlier on Friday, the agency reported nine had died, adding that rescuers had received the parents' permission to make use of heavy equipment after failing to

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