On 22 May 2018, ISIL launched an attack, involving suicide bombers and armored vehicles, on a military outpost southeast of Palmyra and near the T-3 Pumping Station. Pro-opposition sources reported between 26 and 30 pro-government fighters were killed, including 17 non-Syrians, while the military denied the high death toll and put the number of dead at 16 soldiers.[8][9] The next day, ISIL attacked a joint Syrian-Russian military convoy near the city of Mayadin.