More than 40,000 civilians have fled a key town in northwest Pakistan's Swat region as fears grow of a fresh military offensive against Taliban militants, officials said Wednesday. Clashes have flared in the last few days in Mingora, the main town in the one-time ski resort devastated by a nearly two-year Taliban insurgency, raising concerns that a peace deal with the hardliners is close to collapse. "More than 40,000 have migrated from Mingora since Tuesday afternoon," said Khushhal Khan, a senior administration official in Mingora.