Clouds partially covers Mayon volcano' s crater as seen in Legazpi City, Albay province, south of Manila December 28, 2009. Philippine government's vulcanologists officials said on Sunday, Mayon volcano has been calmed over the weekend but warned the public not to be complacent because there could be an explosive eruption soon due to clogging of magma inside and the swelling of its surface. [Xinhua/Reuters]