The bodies of 11 climbers were recovered on Monday a day after a furious eruption of the Mount Marapi volcano as Indonesian rescuers searched for 12 apparently still missing.

Marapi has stayed at the third highest of four alert levels since 2011, a level indicating above-normal volcanic activity and prohibiting climbers or villagers within 3km of the peak, said Hendra Gunawan, the head of the Centre for Volcanology and Geological Disaster Mitigation.

“This means that there should be no climbing to the peak,” Gunawan said, adding that climbers were only allowed below the danger zone, “but sometimes many of them broke the rules to fulfil their satisfaction to climb further”.

About 75 climbers had started their way up the nearly 2,900-metre mountain on Saturday and became stranded. Eight of those rescued on Sunday were rushed to hospitals with burns and one also had a broken limb, said Hari Agustian, an official at the local Search and Rescue Agency in Padang.