Lumajang, E Java, Feb. 19 -- Mount Semeru erupted on Thursday morning, sending an ash column about 800 meters above its summit, authorities said, prompting renewed warnings as the volcano remains on the second-highest alert level.

An eruption occurred at 8:00 a.m. local time, with the ash plume reaching roughly 800 meters above the peak, or about 4,476 meters above sea level, an official at the Semeru observation post said.

The ash column was white to gray and drifted northeast with thick intensity. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 101 seconds.

Data showed three eruptions on Thursday. The first struck at 4:32 a.m., producing an ash column about 500 meters above the ...