TRIPOLI, Libya — Witnesses say Moammar Gadhafi's forces have broken through rebel defenses at an opposition-held city that is closest to the Libyan capital, Tripoli.

They said the forces loyal to the regime of the country's longtime leader were inside Zawiya, 30 miles (50 kilometers) west of Tripoli, after overcoming rebel positions with heavy mortar shelling and machinegun fire.

The rattle of gunfire and explosions could be heard as the witnesses spoke to The Associated Press by phone. They spoke on condition of anonymity because of fears for their safety.

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They say several fires are raging in Zawiya on Saturday.

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