Typhoon Deaths MountIn Philippine IslandsMANILA, The Philippines (UPI) — Typhoon Olga swept across the main Philippine island of Luzon today, leaving a mounting toll of deaths and destruction. Weathermen issued an alert for another storm approaching the country from the Pacific.Flash floods spawned byOlga hit the Manila metropolitan area the hardest. The latest casualty count stood at least 25 dead, most of them drowning victims. A family of seven was missing. More than20,000 refugees were shelteredin temporary relief centers.In addition, the wreckage of a light plane missing since Thursday in stormy weather southeast of Manila was sighted after 24 hours with no sign of survivors among the five aboard. Another small aircraft with eight aboard was missing.Residents of metropolitan Manila, an area with a population of 7.5 million, worked Friday cleaning up debris and wreckage'caused by Olga. President Ferdinand E. Marcos declared a state ofcalamity in the flood-stricken zone to facilitate relief work.Olga was plotted 50 miles southeast of the mountain resort city of Baguio, 160 miles north of Manila, with peak winds of 87 miles an hour. Eleven provinces lay within 70 miles of the typhoon’s path.Another typhoon, Pamela, which hit Guam this week, also was forecast to head toward the Philippines although weather trackers said it might take three to four days before its target is established.AGANA, Guam (UPI) -Typhoon Pamela raked the American island of Guam with 150 mile-an-hour winds today, churning up 10-foot waves that swept ashore and cut the island’s main highway to the south.Authorities said at least30,000 persons — one third of the island’s population — were stranded in the southern portion when the highway was washed out.There were no immediate reports of casualties from Pamela, which ‘ killed 10 persons when it hit the Caroline islands three days ago.About 1,500 miles west, a second typhoon — Olga — hit the island of Luzon in the Philippines. Flash floods from Olga already have killed 22 persons.In Guam, Typhoon Pamela — with gusts up to 190 miles per hour —slowed its forward progress to about six miles per hour