The number of people killed in an Indonesian school collapse has risen to 13, but dozens are still believed to be buried under the rubble without signs of life days after the disaster.

Distraught families have been waiting anxiously near the site in the town of Sidoarjo, on Indonesia's island of Java, hoping to receive any news of their loved ones since the building collapsed on Monday.

On Friday some argued with rescuers, angrily calling for them to speed up the desperate rescue operation, according to an AFP journalist at the scene.

"You said there was no more sign of life, so we want to bury our family immediately," shouted one person who declined to give his name.

"It's been five days!"

Part of the multi-storey boarding school collapsed suddenly on Monday as students gathered for

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