Watch: Indonesia's Sinabung volcano spews new burst of hot ash

A rumbling volcano in western Indonesia on Sunday unleashed an avalanche of scorching clouds down its slopes. Authorities are closely monitoring Mount Sinabung on Sumatra, one of Indonesia’s main islands after sensors picked up increasing activity in past weeks. The volcano in North Sumatra province was shooting smoke and ash more than 1,000 meters (3,280 feet) into the air on Sunday morning, and hot ash clouds traveled 1 kilometer (0.6 mile) southeast, Indonesia’s Volcanology and Geological Hazard Mitigation Center said.