 Before Imbudo struck , officials evacuated over 14 @,@ 000 people to at 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 <unk> <unk> 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 . 
