Looks like any intervention will escalate beyond a NFZ. I think some ground forces might be needed.
The US has a carrier and an amphib group moving to the area.
FT.com / Middle East & North Africa - West weighs military measures
West weighs military measures
By Daniel Dombey in Washington and Peter Spiegel in Brussels
Published: February 25 2011 19:10 | Last updated: February 25 2011 19:10
... Since rebel forces already control much of the coast and border regions, steps to safeguard ports, airports and safe zones could serve to protect them against Col Gaddafi’s forces.
... The White House has added it is looking at the “feasibility” of measures such as a no-fly zone. However, some officials note such a step could bring limited benefits. Libya’s air force is in poor condition, and much of it is in areas held by rebels. Two pilots defected to Malta this week rather than bomb civilians. By contrast, Col Gaddafi’s push to quash the rebellion largely depends on militias, troops commanded by his family members, and foreign mercenaries.
... He added that “Nato as such has no plans to intervene” and that any military action “should be based on a clear UN mandate”. Such a mandate would be hard to achieve, given China’s resistance at the UN Security Council to interventionist steps.