Jakarta, Aug. 19 -- Three active Indonesian volcanoes-Mount Ibu, Mount Lewotobi Laki-laki, and Mount Semeru-erupted in rapid succession on Tuesday night, sending ash plumes across multiple provinces and keeping emergency authorities on high alert.

The Geological Agency under the Ministry of Energy and Mineral Resources (ESDM) reported that Mount Ibu in West Halmahera, North Maluku, suffered three consecutive eruptions within hours.

The first eruption at Mount Ibu occurred at 8:36 p.m. local time (WIT), spewing an ash column 700 meters above its summit.

A second blast followed at 8:58 p.m., reaching 500 meters, before a third eruption at 11:11 p.m. hurled grey-and-white volcanic ash 600 meters eastward. Mount Ibu remains under Alert Lev...