Another 54 people died in the latest eruption, which covered the surrounding area in ash.
Nearly 100 people have now died and 185 have been injured by the blasting volcano. More than 75,000 people have also been evacuated from the area near Mount Merapi, on the outskirts of Yogyakarta city in central Java.
A forensic doctor from Yogyakarta’s police told Metro TV that 54 badly burned bodies were brought to the Sardjito hospital on Friday.
“It is possible the death toll will rise as we search for victims,” he said.
An Indonesian vulcanologist, Surano, warned that the volcano was behaving erratically.
“It’s much worse than in the past. We cannot predict its behaviour,” he said. Mount Merapi, which translates as “Fire Mountain”, has erupted many times over the last 200 years, often with deadly results. In 1930, more than a dozen villages were hit, leaving up to 1,300 dead.