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Bali’s government has warned locals near the Mount Agung volcano to stay away from rivers because of cold lava ploughing down the volcano’s slopes.

Shocking footage shows a lahar – a type of mudflow containing volcanic debris and water – powerfully flowing through a river valley near Mount Agung.

Despite having the consistency of concrete, the combination of water and ash can flow down river valleys at rapid speeds.

A spokesman for Indonesia’s Disaster Mitigation Agency (BNPB) warned against going close to rivers near Mount Agung.