A coalition air raid has killed 13 people, four of them civilians, some 15 km east of the battleground Libyan oil town of Brega, said a rebel civilian official.

The four civilians comprised an ambulance driver and three medical students from Benghazi, part of a rebel convoy of five or six vehicles, said Issa Khamis, liaison officer for the rebels' transitional government in the town of Ajdabiya, east of Brega on Friday. The strike came as rebel fighters were shooting tracer fire into the air to celebrate the entry of an advance column into Brega. NATO said the alliance was concerned about the reports .

“We are looking into these reports. We are always concerned by reports of civilian casualties. NATO's mission is to protect civilians and civilian areas from the threat of attack,” it said, adding that no formal investigation had been launched. — AFP