11.   A storm last month triggered avalanches of volcanic debris that buried Bacolor town in Pampanga and left many communities under water.

12.   But Duque said the floods could be worse this year with the major river systems already heavily silted by volcanic debris.

13.   Four children drowned after heavy rains caused a river choked with volcanic debris from Mount Pinatubo to overflow, disaster relief officials said Wednesday.

14.   Government engineers had previously tried but failed to fill the breached section of the structure with silt and sandbags, which were washed away by new volcanic debris.

15.   However, millions of tons of volcanic debris have filled river channels, forcing new avalanches to cut through previously untouched communities.

16.   However, the deposits are capable of burying villages whenever big chunks of volcanic debris are loosened by rain, he said.

17.   Hundreds of millions of tons of volcanic debris remain on its slopes and are washed down during the rainy season, clogging rivers and burying towns.

18.   In an instant, the river of volcanic debris was upon them.

19.   Instruments set up on Mount Pinatubo to warn of any rampaging flows of volcanic debris have all been stolen, an official said Friday.

20.   Lahar is composed of volcanic debris and water.