United Nations and Libyan officials say they have reached a deal to allow aid workers safe passage to the besieged western city of Misrata but without guarantees from leader Moammar Gadhafi that his forces will stop shelling the rebel enclave.A U.N. spokeswoman said on Monday that Mr. Gadhafi has agreed to let an international assessment team into Misrata as part of an accord on humanitarian access to the capital, Tripoli and other Libyan cities. She said the Libyan government will ensure the team's security only in areas under its control.