Doctors rushed to treat wounded Pakistani civilians and desperate refugees looted UN supplies on Saturday, as thousands of troops backed by bomb-dropping warplanes sought to purge Taliban militants from a northwestern valley. The army said it killed as many as 55 more Taliban fighters in clashes in the Swat Valley on Saturday. Four soldiers were wounded, a military statement said. Further south, a suspected US missile strike killed nine people, mostly foreigners, in another militant stronghold near the Afghan border, officials said. The identities of the victims not immediately unclear. Pakistan's leaders, encouraged by the United States, launched a full-scale offensive in Swat this week to halt the spread of Taliban control in districts within 60 miles (100 kilometers) of the capital.