The United Nations says floods in Pakistan caused by heavy monsoon rains are affecting at least a million people. It says many communities are still cut off by the water. A government official said that at least 800 people have been killed in the past week. Lyse Doucet has been travelling through the affected region.

Two days after large parts of northwest Pakistan were hit by heavy monsoon rains, relief teams are still struggling to respond to this major disaster. The head of the UN's coordination office in Pakistan, Manuel Bessler, told the BBC he still could not describe with certainty the full scale of this emergency. He is still having trouble reaching his own offices in some of the worst-affected areas where electricity, telephone lines and roads remain cut. He said 45 bridges have been washed away in the Swat Valley alone.