least 60 shelters. Government offices were closed along the typhoon's path, and schools were closed in the capital, Manila. PAGASA issued a number 4 warning signal, the highest level, for three northern provinces, indicating the imminent threat of a powerful storm. Despite the warning, a post-storm survey in Isabela province indicated that 34% were unaware of the storm's arrival, while others believed the typhoon would not be as strong. In Manila, four flights were canceled at Ninoy Aquino International Airport, and the Manila Light Rail Transit System was shut down for two hours. Travel by ship and bus were halted in some areas. On July 22 before the storm struck, the Philippine military was put on red alert, increasing security at the presidential palace. The military stated it was due to the typhoon, although newspapers suggested it was to prevent a coup attempt; a failed coup ultimately did occur on July 27 in what would become known as the Oakwood mutiny. The Hong Kong Observatory issued a number 8 warning signal, indicating the potential for gale-force winds within the territory. At Hong Kong International Airport, at least 100 flights were canceled or delayed. Most ferry and some bus lines were temporarily suspended. The threat of the storm caused 16 flights to be canceled and another 54 delayed at Guangzhou Baiyun International Airport. On Hainan island, 32 canceled flights stranded about 1,500 travelers. The threat of the storm forced British Prime Minister Tony Blair to shorten a trip to the territory. The Hong Kong Stock Exchange opened 30 minutes late as a result of the typhoon. On the mainland at Yangjiang, more than 30,000 people evacuated ahead of the storm. Impact Philippines Typhoon Imbudo was the strongest typhoon to strike Luzon since Typhoon Zeb five years prior, and was the fifth storm in eight weeks to affect the country. The typhoon left widespread areas flooded for several days. Cagayan Valley was largely isolated after a bridge was damaged in Ilocos Norte. Damage was heavy in the region, totaling P2.2 billion (PHP, $40 million USD), and over 80,000 people were displaced by the storm. Damage was heaviest in Isabela, where damage was estimated at P1.9 billion (PHP, US$35 million), mostly to crops and killed livestock. There, winds and rain knocked down trees and caused a province-wide power outage. Most trees less than three years old fell during the high winds. In Isabela