N. officials say relief and rescue efforts have been hampered by poor weather conditions, with helicopters in the northwestern Swat Valley grounded on Friday.

在西北部斯瓦特山谷进行救援的直升机星期五被迫停飞。

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U.N.Office for Coordinating Humanitarian Affairs spokeswoman Nicki Bennett says the mountainous northwestern part of the country normally does not see disaster flooding.

VOA: standard.2010.08.02

Since August, the U.N. has registered more than 500, 000 Pakistanis forced to flee their homes by fighting in other northwestern parts of the country.

CNN: Displaced Pakistanis crowd camps as they flee fighting