TRIPOLI, Libya — Moammar Gadhafi loyalists broke through rebel lines at an opposition-held city that is closest to the Libyan capital on Saturday, while anti-government forces celebrated the capture of a key oil port from the regime on the eastern coast.The contrasting fortunes of the two warring sides suggest that the conflict in Libya is veering toward a lengthy civil war, with the government fighting fiercely to maintain its hold in Tripoli and surrounding areas and the rebels pushing their front westward from their eastern stronghold.Read More... More on Libya Protests