ISRAELI helicopters fired missiles in three separate air raids in the Gaza Strip early today, witnesses said. The first strike destroyed a pro-Hamas Islamic charity in Gaza City, local residents said. A minute later, the helicopters fired at a cemetery in Khan Younis that militants used as a launching pad to fire mortars at an adjacent Jewish settlement, witnesses said. Palestinian gunmen fired shots into the air as crowds gathered at the site of the Gaza City blast. Ambulances raced to the scene. Witnesses said one man was struck by flying debris in the Gaza City blast but hospitals said they had no casualties yet. The Israeli army acknowledged one of the raids, saying it had struck an ammunition depot in Khan Younis used by militants of Hamas, a group sworn to Israel's destruction. The third raid was on a target in central Gaza, witnesses said. There were no immediate reports of injuries in any of the raids, which came hours after an Israeli woman was killed in the first deadly rocket assault from Gaza in months. The Israeli army also cut off a key Gaza highway in two areas to restrict Palestinian travel in the area.