CNN —At least 37 people have been killed, and more than a dozen injured on the Indonesian island of Sumatra after heavy rains triggered flash flooding and a cold lava flow from an active volcano, search and rescue officials said on Sunday. Cold lava, also known as lahar, is a mixture of volcanic debris such as ash, sand and pebbles that flows down a volcano’s slopes during wet weather. Images shared by Indonesia’s disaster response agency showed thick mud and ash partially covering roads and mountainside villages near the foot of Mount Marapi, an active volcano in western Sumatra. Adi Prima/Anadolu/Getty ImagesThe 2,891-meter-high (9,500 feet) Mount Marapi is among the most active volcanoes in Indonesia, which lies on the Pacific Ring of Fire with 127 active volcanos – more than anywhere else in the world. It has erupted 11 times during the early 21st century, with it deadliest single event having killed 60 people in 1979.

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Persons: Marapi, Abdul Muhari, Rezan Soleh, Adi Prima Organizations: CNN, Getty, Anadolu Locations: Indonesian, Sumatra, AFP, Lima Kaum, West, Datar District, Indonesia