The latest NATO air strikes shook the eastern outskirts of Tripoli before dawn Sunday. It was not immediately clear what targets were struck or whether there were any casualties. Gadhafi has used the western city as his main power base in a five-month-long battle against rebels trying to end his 42-year-long autocratic rule. 

Libyan rebels who control most of eastern Libya and parts of the west are trying to advance on Tripoli from both fronts with the help of NATO air strikes on pro-Gadhafi forces.

NATO reported hitting a range of Libyan military targets near Tripoli on Saturday, including a storage facility, three radars and a surface-to-air missile launcher. It says alliance warplanes also struck pro-Gadhafi armored vehicles and rocket launchers near Brega. 

Libyan rebels have been trying to capture the strategic oil port from Gadhafi loyalists in recent days, but the better-armed loyalists have slowed the rebel advance through the use of landmines and shelling. At least 10 rebels have been killed in the fighting.