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Washington (CNN) -- U.S officials defended America's role in the NATO-led mission in Libya Monday, amid criticism that Washington is not doing enough as the coalition struggles.

White House spokesman Jay Carney downplayed reports that NATO is running out of munitions to fight the war.

Carney told reporters that "a dramatic increase" in NATO sorties Sunday and Monday "demonstrates the capacity of NATO to fulfill its mission" in securing a no-fly zone over Libya.

"We have no plans to change our posture," he said.