US and Egyptian special forces have reportedly been providing covert training to rebel fighters in the battle for Libya, Al Jazeera has been told.

An unnamed rebel source related how he had undergone training in military techniques at a "secret facility" in eastern Libya.

He told our correspondent Laurence Lee, reporting from the rebel-stronghold of Benghazi, that he was sent to fire Katyusha rockets but was given a simple, unguided version of the rocket instead.

"He told us that on Thursday night a new shipment of Katyusha rockets had been sent into eastern Libya from Egypt. He didn't say they were sourced from Egypt, but that was their route through," our correspondent said.