Libyan rebels on Saturday called for NATO to continue raids against Colonel Gaddafi despite reports that coalition air strikes killed 13 of their men.
Friday’s bombing took place during the battle for the strategic oil town of Brega in eastern Libya.
Abdel Hafiz Ghoga, a spokesman for the National Transitional Council, said the deaths were a “regrettable incident.”
“They happened by mistake as a consequence of the advance of the revolutionaries,” he said. “The military leadership is working to prevent a repeat of such incidents.”
The rebel forces are largely made up of untrained volunteers.
The Reuters news agency said hundreds of them fled the battlefield when they came under heavy mortar fire.
NATO said on Saturday that it would investigate the reports.
It is said that a coalition warplane struck a rebel position in Brega after interpreting gunshot celebrations as anti-aircraft fire.