On Thursday, the US-led coalition air force bombed positions of the Iraqi Popular Mobilization Units (PMU).
According to the Iraqi media, US-led coalition airstrikes hit PMU units deployed in the area in order to prevent ISIS infiltration attempts from the territory of Syria and resulted in casualties among the PMU personnel.
The incident took place in the area close to the al-Bakumal border crossing roughly in the same time when the US-led coalition carried out airstrikes on Syrian government forces advancing near the al-Tanaf area.
Some experts believe that Washington was concerned that the PMU could help the Syrian military to secure the Syrian-Iraqi border. The US sees this possibility as a threat to its influence in the region.