"Sixteen border guards, including a captain, were killed and four wounded in an attack targeting their headquarters in Al-Walid, near the Syrian border," Faleh al-Issawi, deputy head of Anbar provincial council, told AFP.
He said the attack occurred at around 6:00 am (local time).
A commander in the Iraqi border force and a police major confirmed the death toll.
The Al-Walid crossing is one of the country's most remote outposts and lies near the westernmost point in Anbar province where the borders of Iraq, Syria and Jordan meet.