Allied warplanes are now attacking regime forces in built-up areas in the rebel strongholds of Misrata and Ajdabiya, but fighting is continuing on the ground.
Some analysts believe the rebels do not have what it takes to defeat Mr Gaddafi by themselves, and warn that an allied ground invasion of Libya is almost a certainty.
But the US is hosing down any ideas of putting troops on the ground and fending off suggestions it is already at war with Libya.
In a briefing that stuck carefully to the official script, US Rear Admiral Gerard Hueber would not explain what the coalition would do next if Mr Gaddafi's forces could not be beaten from air.
"Can you achieve your mission of 1973 UN Security Council resolution without ground forces?" a reporter asked.
"It's my primary focus today to discuss the current operations that we are in, and I would not project or discuss future military operations," Rear Admiral Hueber said.
"The impression we get from you is it's gotten worse since the allies started bombing. Is that accurate?" another reporter asked.Popular online sale-
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"Our mandate now is to enforce the no-fly zone and to allow humanitarian assistance to be available to the Libyan people," Rear Admiral Hueber replied.
When asked whether or not the US was at war with Libya, US State Department spokesman Mark Toner also had trouble answering.
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"We are, uh, implementing UN Security Council resolution 1973. It is clearly a combat operation - a combat mission," he said.
"As the president made very clear, there will be no US ground forces involved in this."
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Whatever the mission ends up becoming, the US hopes to hand over responsibility for command of the mission as early as this weekend.