Helicopters dropped relief supplies to some of the more than 800,000 people hit by monsoon flooding in southwest Pakistan, as flash floods killed 20 in an area bordering Afghanistan, officials said. Many of those affected were stranded in high open areas or on roofs in Baluchistan province following Cyclone Yemyin, CNN reported. Twenty people died in flash floods Thursday in the northwestern Khyber Agency tribal region, said government official Ilyas Khan. The total number of lives lost in the unusually severe flooding is still unknown.