The strike took place a few miles away from the armed opposition rebel base in the town of al-Tanf, where American and British special forces are training rebels opposed to Bashar al-Assad.
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According to a US defense official, the pro-Assad militia convoy was heading to a remote coalition garrison near the Jordanian border.
The US official also said the coalition air strike did not directly target the Syrian army but Shia militias who support the Syrian government which was operating in the area.
“A convoy going down the road didn’t respond to numerous ways for it to be warned off from getting too close to coalition forces in At-Tanf,” the official told AFP on condition of anonymity.
Attempts to halt the convoy included a call to the Russians – who are working with the Syrian regime- the official said, before “show of force” above the vehicles, followed by warning shots.
“Then there was finally a strike against the lead portion of that movement,” the official said, adding that while the convoy was “significant” in size, only the lead vehicles were hit.
The attack allegedly destroyed tanks and other military vehicles belonging to the Iranian-backed Imam Ali Brigade, according to pro-government media outlets.
Attack after notification
Muzahem al Saloum, from the Maghawir al Thwra group, told Reuters that the jets struck after rebel forces clashed with advancing Syrian and Iranian militias that were about 27km from the base.
“We notified the coalition that we were being attacked by the Syrian army and Iranians at this point and the coalition came and destroyed the advancing convoy,” Saloum said.
Earlier today, pro-Iranian government media outlets had reported that 3,000 Hezbollah fighters were deployed to the Al-Tanf region to protect the area from “US interests”.