Tripoli, Libya (CNN) -- Opposition forces claimed a major victory Sunday in Libya, managing to block an onslaught by Libyan leader Moammar Gadhafi's troops and maintain control of the key city of Misrata, an eyewitness said. Using machine guns, sticks and anything else they could find, crowds protected the courthouse, serving as an operations center by the opposition in Misrata, and successfully repelled Gadhafi militias armed with tanks and heavy artillery, the witness said. "The will and the determination and dedication that people are showing here on the ground, it just makes you speechless," he said. A doctor at Central Misrata Hospital said 42 people were killed -- 17 from the opposition and 25 from the pro-Gadhafi forces -- and that 85 people were wounded in the fighting, which continued on the city's outskirts. The youngest victim, 3 years old, was killed by direct fire, the doctor said.
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NEW: The UN's chief talks Sunday with Libya's foreign minister, urging end to violence
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A doctor says at least 42 were killed in Misrata; the UN says aid has been blocked
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Libyan state TV says troops are under orders not to enter cities controlled by "gangs"
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Police search cars to make sure no anti-Gadhafi forces come out in Tripoli, a witness says
The team went to @placeholder to initiate contacts with the opposition.