Pro-democracy fighters are battling Muammar Gaddafi's, the Libyan leader, forces on the country's western border, while fighting continues in the besieged rebel-held city of Misurata.
A rebel spokesman told Al Jazeera on Wednesday that heavy shelling had prevented ships from docking in Misurata to deliver humanitarian supplies and evacuate the wounded.
"The attacks have prevented a number of ships seeking to enter the port to evacuate the wounded from Misurata," Ahmed Hassan, the spokesman, said.
"Other ships are also waiting to unload shipments from humanitarian agencies."
The rebels said the Libyan army had withdrawn from central Misurata but that fierce fighting was still ongoing for control of the city's port.