ALGIERS - Forces loyal to Libyan leader Muammar Gaddafi killed 18 civilians in the city of Misrata on Tuesday and the troops are still shelling and fighting skirmishes with rebels, a rebel spokesman said. But a blockade of Misrata's Mediterranean port by pro-Gaddafi forces has now ended, allowing two ships to deliver humanitarian aid and evacuate people wounded in the fighting, the spokesman told Reuters by telephone.