A drone dropped explosives near US forces stationed at Erbil airport in northern Iraq late on Wednesday, Kurdish officials said, with no immediate reports of casualties.br br A separate rocket attack killed a Turkish soldier at a military base nearby, the Turkish defence ministry said.br br It was the first known attack carried out by an unmanned aerial drone against US forces in Erbil, amid a steady stream of rocket attacks on bases hosting US forces and the embassy in Baghdad that Washington blames on Iran-backed militias.