Official Arab sources report on an airstrike, within the last couple of hours on Friday, in the al-Bukamal (Abu Kamal) area on the Syrian-Iraqi border. According to the report, a military truck belonging to Shiite Iraqi militias was attacked.
Some of the reports attribute the attack to the US-led coalition.
[Wikipedia: Abu Kamal or Al-Bukamal is a city on the Euphrates River in the Deir ez-Zor Governorate of eastern Syria near the border with Iraq. It is the administrative center of the Abu Kamal District and the local subdistrict.]