Pakistani children cool off in a river canal during heat wave in northwest Pakistan's Peshawar on July 14, 2013. Temperatures reached over 40 degrees Celsius in many parts of the country Sunday. (Xinhua/Umar Qayyum)

Pakistani children swim in a river canal during heat wave in northwest Pakistan's Peshawar on July 14, 2013. Temperatures reached over 40 degrees Celsius in many parts of the country Sunday. (Xinhua/Umar Qayyum)