GNA forces enter Sirte. However, an LNA counterattack using drones, aircraft and artillery drove the attackers back,[12] inflicting heavy casualties on GNA fighters and Syrian rebels.[13][14] According to Libyan and Bulgarian sources, an airstrike launched from an unknown aircraft, possibly MiG-29s, destroyed a Turkish military convoy, leaving casualties (including Turkish servicemen and Syrian rebels) and stopping the GNA advance.[15][16]