Death toll from Indonesia school collapse rises to 54

Part of the multi-storey building on Indonesia's Java island collapsed suddenly last week as students gathered for afternoon prayers.

The death toll from an Indonesian school collapse rose to 54 on Monday, officials said, as rescuers searched for more than a dozen still missing.

Rescuers are still working around the clock in the rubble of the Islamic boarding school. (REUTERS)

Part of the multi-storey building on Indonesia's Java island collapsed suddenly last week as students gathered for afternoon prayers.

As of this morning, "we have retrieved 54 dead victims, including five body parts," National Search and Rescue Agency (Basarnas) operations director Yudhi Bramantyo told a press conference.

Rescuers were still working around the clock in the rubble of the Islamic boarding school.

"We hope we can conclude the recovery today (Monday), and we will return the bodies (to the families)," Yudhi said.

The collapse was Indonesia's deadliest disaster so far this year, Budi Irawan, the deputy head of the national disaster agency (BNPB), said.

At least 13 people were still missing, he added.

Investigators have been examining the cause of the collapse, but initial indications suggest that substandard construction may have contributed to the incident, according to experts.

Lax construction standards have raised widespread concerns about building safety in Indonesia.

At least three people were killed and dozens were injured in September when a building hosting a prayer recital collapsed in West Java.