Libyan rebels near Ajdabiya 'killed in Nato air strike'
Rebels in eastern Libya say their forces have been mistakenly hit in a Nato air raid.
Doctors in Ajdabiya told the BBC 13 rebel fighters had been killed by the strike on a rebel tank position.
The BBC's Wyre Davies reports chaotic scenes on the outskirts of Ajdabiya, with rebel forces in retreat reporting being hit by Nato air strikes.
It is the third such incident in recent days involving international forces deployed to protect Libyan civilians.
One rebel commander told the BBC he saw at least four missiles land among rebel fighters.
Many people have been killed and many more have been injured, he said.
The rebels had been taking a group of tanks, armoured vehicles and rocket launchers near the front line between the towns of Ajdabiya and Brega in more than 30 transporters.
Ambulances were seen heading in the opposite direction, towards the hospital in Ajdabiya, following the apparent Nato hit.
There is considerable anger among rebel troops after what appears to have been a terrible mistake, our correspondent says.
Rebel forces in the area began retreating on Wednesday after heavy bombardment from government forces.
They had been calling for more Nato air strikes in recent days
There has been no confirmation from Nato over the incident yet.