By Sahibzada Bahauddin
KHAR, Pakistan, Aug 15 (Reuters) - About 100,000 Pakistani villagers have fled clashes between security forces and militants in a northwestern region raising the danger of a big humanitarian problem, a government official said on Friday.
Security forces and militants have been fighting in the Bajaur region on the Afghan border, a known sanctuary for al Qaeda and Taliban fighters, since the militants attacked a security post last week.
About 170 people have been killed, including some civilians, officials have said. The fighting has included strikes on militants by fighter jets and helicopter gunships.