In late July 2010 monsoon rainfall caused flash floods swelling the river Swat and killing over 1,100 people. Alight's Emergency Response teams began work as the flooding subsided in early August, providing clean water and mobile health clinics for survivors. Alight's mobile health teams, especially water and sanitation teams, assembled and began coordinating with partners and authorities. Swat, Nowshera, Mardan, and Peshawar were the most severely affected areas. Roads were washed out, bridges gone, internet and telephone were functioning intermittently. Many affected communities remained inaccessible except by helicopter; others had been entirely obliterated.