Tripoli- Dozens of people are thought to have drowned after a boat loaded with migrants sank off the coast of Libya. At least 170 passengers are reported to have been on board, but so far the coastguard has only rescued 17 people. Separately, unidentified planes are reported to have bombed militant positions near Tripoli airport, leaving at least 10 people dead. Libya has been in turmoil with fighting between rival militias who led the 2011 uprising against Col Muammar Gaddafi. The violence has been centered around the airport and in the eastern city of Benghazi. Local fishermen raised the alarm at dawn on Saturday, saying that a boat had capsized in the sea east of Tripoli. It had disappeared underwater by the time rescuers arrived at the scene, and the few people who were still alive were surrounded by the bodies of those who were not. Coastguard officials said they had no boats of their own, so had to commandeer fishing vessels.