Fire from the burning port could be seen from kilometres away, rising into the night sky.
"All NATO's targets are military in nature and are directly linked to the Gadhafi regime's systematic attacks on the Libyan people," said Rear-Admiral Russell Harding, deputy commander Operation Unified Protector.
"Given the escalating use of naval assets, NATO had no choice but to take decisive action to protect the civilian population of Libya and NATO forces at sea," he added.