Rescuers have pulled five survivors from a collapsed school in Indonesia as frantic parents demanded searchers speed up efforts to find dozens of children believed still trapped in the rubble two days on.

Part of the multi-storey boarding school, in the town of Sidoarjo on the island of Java, gave way suddenly on Monday, local time, as students gathered for afternoon prayers.

"Today (Wednesday) we managed to evacuate seven victims, five of them were rescued alive, and two were found dead," Yudhi Bramantyo, operational director of the search and rescue services, told a press briefing in Sidoarjo, 30 kilometres from the city of Surabaya.

"The five survivors were able to communicate," he added.

At least six people have now been killed in the disaster.

A magnitude-6.5 quake complicated th

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