Flash floods triggered by torrential rains Sunday killed at least 45 people in northwest Pakistan, AP quoted officials as saying. Rains started overnight Saturday and caused flash flooding in several districts of Khyber Pakhtunkhwa province, said a Pakistani national disaster management official, Latif ur Rehman. Another 34 people were admitted to hospitals with injuries, he said. Flash floods are commonly triggered during South Asia's summer monsoon season. Pre-monsoon rains like the current downpour frequently cause damage in Pakistan, particularly in rural villages with minimal infrastructure.