NATO ships began patrolling off Libya's coast Wednesday as airstrikes, missiles and energized rebels forced Muammar Gaddafi's tanks to roll back from two key western cities, including one that was the hometown of army officers who tried to overthrow him in 1993.

Libya's opposition took haphazard steps to form a government in the east, as they and the U.S.-led force protecting them girded for prolonged and costly fighting. Despite disorganization among the rebels _ and confusion over who would ultimately run the international operation _ coalition airstrikes and missiles seemed to thwart Gadhafi's efforts to rout his opponents, at least for now.

Coalition aircraft hit a fuel depot in Tripoli, a senior government official told reporters in a late-night news conference. Deputy Foreign Minister Khaled Kaim at first denied reports that Gadhafi's compound in Tripoli was hit earlier, then bactracked and said he had no information about that. Other targets Wednesday were near Benghazi and Misrata, he said.

U.S. Defense Secretary Robert Gates acknowledged there is no clear end to the international military enforcement of the no-fly zone over Libya, but President Barack Obama said it "absolutely" will not lead to a U.S. land invasion.

From Ajdabiya in the east to Misrata in the west, the coalition's targets included Libyan troops' mechanized forces, mobile surface-to-air missile sites and lines of communications that supply "their beans and their bullets," said Rear Adm. Gerard Hueber, a top U.S. officer in the campaign in Libya.

He asserted that Gadhafi's air force has essentially been defeated. He said no Libyan aircraft had attempted to fly over the previous 24 hours.

"Those aircraft have either been destroyed or rendered inoperable," Hueber told Pentagon reporters by phone from the U.S. command ship in the Mediterranean Sea.

A doctor in Misrata said Gadhafi's tanks fled after the airstrikes, giving a much-needed reprieve to the besieged coastal city, which is inaccessible to human rights monitors or journalists. The airstrikes struck the aviation academy and a vacant lot outside the central hospital, the doctor said.

"Today, for the first time in a week, the bakeries opened their doors," the doctor said, speaking on condition of anonymity for fear of reprisals if Gadhafi's forces take Libya's third-largest city, 125 miles (200 kilometers) southeast of Tripoli.