U. S. Chinook helicopters arrive in Kalam, Pakistan to evacuate stranded tourists on Thursday, Aug. 5, 2010.The floods have already killed an estimated 1,500 people over the past week, most of them in the northwest, the center of Pakistan's fight against al-Qaida and the Taliban. An estimated 4.2 million Pakistanis have been affected, including many in eastern Punjab province, which has seen numerous villages swallowed by rising water in recent days. (AP Photo/Sherin Zada)
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