BENGHAZI, Libya (AP) -- Moammar Gadhafi's forces are bombarding the last rebel-held western city as the international community discusses how to enforce a no-fly zone and protect the Libyan people.

   A doctor says at least six people were killed Friday when tanks moved into Misrata and opened fire. He says a hospital and a mosque were shelled.

   The doctor, who spoke on condition of anonymity because he feared reprisals, says the tanks then pulled back to the outskirts of the city.

   Misrata, Libya's third-largest city, 125 miles (200 kilometers) southeast of Tripoli, has been sealed off by Gadhafi troops in a blockade that has cut off most water and food supplies for days.

   Rebels fighting to oust the longtime Libyan leader are on the defensive in their eastern stronghold.