Britain is due to hold urgent talks on Libya's humanitarian crisis at the United Nations later on Monday. The besieged city of Misurata is one of the main places of concern.
An opposition spokesperson says shelling by Muammar Gaddafi's forces on Sunday alone killed at least 17 people.
Al Jazeera has gained exclusive access to the city.
Cameraman Craig Pennington and corrrespondent Jonah Hull boarded a trawler carrying supplies from Malta, and made the 24-hour voyage to Misurata.
Source: Al Jazeera