There are no signs of life under the wreckage of a collapsed Indonesian school where 59 people are still missing, rescuers have said.

Hundreds of students, most of them teenage boys, were inside the two-storey Islamic boarding school in the town of Sidoarjo when it collapsed on Monday. At least five students were killed and about 100 injured, officials said.

Thirteen people have been freed from the debris since rescue efforts began, though two later died in hospital. Rescue operations had been challenging due to the unstable structure of the building.

On Thursday, the disaster mitigation agency (BNBP) reported that rescuers using thermal drones failed to detect signs of life. Lt Gen Suharyanto, head of the BNBP, announced that they would begin using heavy equipment to lift or cut through concrete slabs to continue searching.

Anxious families have gathered at the school, hoping for any news of their loved ones. Many students have been missing for days, leading relatives to hold onto hope despite the grim updates.