The number of students confirmed dead after the collapse of an Islamic school building in Indonesia's East Java province rose to nine on 3 October, the country's disaster mitigation agency said, as the search for survivors continued.

The Al Khoziny school in the town of Sidoarjo collapsed 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 had been prepared as rescuers continued looking for more than 50 students - mostly teenage boys from the ages of 13 to 19 - still trapped under the rubble, the disaster mitigation agency said.

The death toll rose from five a day earlier, the agency said, adding that rescuers had received the parents' permission to make use of heavy equipment after failing to find signs of life during previous efforts.  

"Every family of the victims has given their blessing if the heavy equipment gets in there and disturbs the bodies beneath the rubble," said agency chief Suharyanto. 

Rescuers dug through tunnels in the remains of the building, calling out the boys' names and using sensors to detect any movement, but found no signs of life, photos shared by the search and rescue agency show.

Fourteen rescued victims were in treatment by Friday, the disaster agency said.

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