Heavy fighting around the rebel-held Libyan town of Misrata has left at least 30 people dead, while more than 20 rebels have been killed in two days of clashes in Zlitan, between Misrata and Tripoli.
And Gaddafi forces have also shelled the world-heritage listed town of Ghadamis for the first time.
That opens up a new front. But this five-month civil war still looks deadlocked while cracks are appearing among NATO allies.
Outgoing US Defense Secretary, Robert Gates, has delivered a sharp rebuke on his valedictory tour in Brussels.
He accused some members of not being willing or able to pull their weight in the campaign and simply relying on America to make up the difference.
Meanwhile diplomatic pressure on Muammar Gaddafi to step down is continuing.
Turkey says it has offered the Libyan leader a guaranteed exit but has received no response.