FILE - Lava cascades down the slopes of Mayon volcano in its continuing "mild eruption" as seen from Legazpi city in Albay province about 340 kilometers (212 miles) southeast of Manila, Philippines in this timed exposure shot on Aug. 7, 2006. On Friday July 10, 2009, Philippine scientists say the cone-shaped Mayon volcano, the country's most active, is rumbling again, emitting steam and a strong glow at the summit crater that can be seen with the naked eye and raised the five-step alert system from 1 to 2. State volcanologists say the frequency of volcanic earthquakes has increased, signifying the possible movement of magma below the surface, which could lead to ash explosions and eventually eruption. (AP Photo/Bullit Marquez, FILE)