At least 2,000 people have been evacuated to safer grounds following Monday's explosion on Mt. Bulusan in the central Philippine province of Sorsogon.

Residents of Irosin township, Sorsogon province, about 600 kilometers (373 miles) southeast of Manila, Philippines, watch Mt. Bulusan volcano as it spews ash into the sky Monday, Feb. 21, 2011 in another phreatic explosion. Volcanologists warned there might be steam-driven phreatic explosions in the next days but alert level stays at No.1, the lowest in the four-level warning system. (Xinhua/Reuters Photo)
Maj. Harold Cabunoc, spokesman of the Army's 9th Infantry Division, said military trucks started evacuating the residents living at the foot of the volcano soon after they received a report of the explosion.

Cabunoc said the soldiers have brought 400 families to evacuation centers in Sorsogon. A total of 300 families were brought to the Gallano High School in Irosin town while the other 100 families were taken to the Cogon Elementary School in Juban town.

The Philippine Institute of Volcanology and Seismology ( PHILVOCS) reported Mt. Bulusan exploded 9:15 a.m., local time. Ash from the steam-triggered explosion hit as high as two kilometers, according to PHIVOLCS director Renato Solidum said.

PHIVOLCS hoisted an alert level 1 on Mt. Bulusan and advised people not to enter inside the four-kilometer radius, designated as a permanent danger zone. The agency is also advising pilots not to fly close to the volcano's summit.

Mt. Bulusan is the highest peak in Sorsogon and covers a land area of 3,672 hectares. The volcano began spewing ash and steam in December last year.

VietNamNet/Xinhuanet