U.S. officials have accused Iran of orchestrating and supplying materials for a drone attack launched against U.S. and coalition forces in Syria in mid-October. While the drones were not launched from Iran, according to the officials, they were Iranian-made and Iran allegedly "faciliated" their use. U.S. and coalition troops use the al-Tanf base to train local forces and conduct counter-ISIS operations. The attack, which used as many as five explosive-packed drones, did not cause any injuries or deaths.