Indonesian rescuers recovered the bodies of at least 17 people who were swept away in flash floods or buried under tons of mud and rocks that hit hilly villages on the country’s main island of Java, officials said Tuesday.

The heavy rains caused rivers to overflow on the main island of Java, flooding nine villages and sending mud, rocks, and debris cascading down the mountainsides.

Indonesian rescuers have retrieved four more bodies as they resumed their search for people missing after floods and landslides on Indonesia’s main island of Java, bringing the death toll to 21.