BENGHAZI (AFP) - Moamer Gaddafi's forces on Monday stormed the rebel-held city of Misrata near Tripoli killing at least 40 people, as more countries joined an operation to try enforce a no-fly zone over Libya. A rebel spokesman reached by telephone in Misrata, Libya's third city 214 kilometres east of Tripoli, said Gaddafi loyalists had opened fire with tanks while snipers on roofs picked off people in the streets. A medic in the city, speaking by telephone against a background of gunfire, confirmed a death toll of 40 and said at least 300 people had been injured. "Casualties fell in their dozens," after snipers on rooftops and a tank "fired on demonstrators," the rebel spokesman said. He said loyalist forces earlier "forcibly rounded up some 500 people from outside the city."