Nato forces have reportedly launched fresh air strikes on Colonel Gaddafi's forces near the key Libyan oil town of Brega.
Rebels said the troops' convoy of eight vehicles was hit early on Tuesday and two trucks mounted with machine guns were destroyed.
Both sides are battling for control of the key eastern port, which has changed hands several times.
Opposition fighters have been asking the coalition to assist them with bombardments against the dictator's troops for days.
Sky's Sam Kiley, in Ajdabiya, eastern Libya, said: "The fact that there have been some air strikes, we believe, should be very encouraging to them.
"(The rebels) are very anxious to take the oil terminal at Brega so they can begin to export oil through an arrangement with Qatar."
Meanwhile, the Libyan government has said it is ready to discuss reforms to its political system, but insists that Col Gaddafi must be allowed to stay in the country.