Lumajang, Jawa Timur, April 5 -- An eruption at Mount Semeru on the Lumajang-Malang border in East Java triggered a pyroclastic flow reaching 3.5 kilometers on Sunday morning.

"An eruption occurred at 2:02 a.m. with an ash column reaching approximately 1,000 meters above the summit," observation post officer Yadi Yuliandi said in a written report.

He said the thick gray ash column drifted westward. The eruption was recorded on a seismogram with a maximum amplitude of 22 mm and lasted about 3 minutes and 29 seconds.

"The eruption was accompanied by a pyroclastic flow reaching 3.5 kilometers from the summit," he said.

The 3,676-meter-high volcano erupted again at 6:55 a.m., producing an ash column about 800 meters high.

The ash appeare...