Southeast Asia was coping with a weekslong heat wave on Monday as record-high temperatures led to school closings in several countries and urgent health warnings throughout the region. Millions of students in all public schools across the Philippines were ordered to stay home Monday after authorities canceled in-person classes for two days. Cambodia this year is facing the highest temperatures in 170 years, Chan Yutha, a spokesperson for the Ministry of Water Resources and Meteorology, told The Associated Press on Monday.