
Monsoon rains eroded and finally collapsed the lava dome atop 12,060-foot Mount Semeru, causing the eruption, according to National Disaster Management Agency spokesperson Abdul Muhari.
Several villages were blanketed with falling ash, blocking out the sun, but no casualties have been reported. Several hundred residents, their faces smeared with volcanic dust and rain, fled to temporary shelters or left for other safe areas.
Thick columns of ash were blasted more than nearly 5,000 feet into the sky while searing gas and lava flowed down Semeru’s slopes toward a nearby river.