That wasn't the "US coalition". It was Putin's puppet Assad. You should stop listening to the BS from Putin.
https://www.nytimes.com/2016/09/25/w...own-apart.html
The Syrian Air Force first dropped barrel bombs from helicopters on a United Nations humanitarian aid convoy, then fired rockets from jets, then strafed survivors with machine guns, United Nations investigators said Wednesday in a report that found government forces had not only committed the attack in Septemberbut had done so deliberately, a war crime.
The attack, which killed 14 aid workers and stoked international outrage, was “meticulously planned” and “ruthlessly carried out,” the report said.
It called the attack “one of the most egregious” of many war crimes that investigators said had been committed during the Syrian government’s five-month offensive to take full control of the northern city of Aleppo.
The report, by a United Nations commission of inquiry that has been monitoring Syria’s conflict for years, is one of the most hard-hitting official assessments yet.
https://en.wikipedia.org/wiki/Septem..._Convoy_attack