ISIS attacked US forces in Syria in a complex and coordinated attack

U.S. forces in southern Syria came under attack by Islamic State militants around midnight local time on April 8, joining with local partner forces to repel the assault in an hours-long fight that required multiple airstrikes and left three U.S.-backed Syrian fighters dead.

U.S. special-operations advisers were on the ground near the al-Tanf border crossing when a force of 20 to 30 fighters with the Islamic State, the terrorist group also known as ISIS or ISIL, attacked in what a U.S. Central Command spokesman called a “complex and coordinated” attempt to take the base from the coalition.

Also read: Here’s how the U.S. hit that Syrian airbase

“U.S. and coalition forces were on the ground in the area as they normally are, and participated in repulsing the attack,” said Air Force Col. John J. Thomas, a spokesman for Central Command, according to the Associated Press.

“There was close-air support that was provided, there was ground support that was provided, and there was med-evac that was supported by the coalition,” Thomas added. No Americans were killed or wounded.

Marines train for attacks like this. (Official Marine Corps photo by Lance Cpl. Joseph A. Prado)

“Clearly it was planned,” Thomas told reporters at the Pentagon. “The coalition and our partner forces had the resources to repulse that attack. A lot of them wound up being killed and the garrison remains controlled by the people in control before being attacked.”

“Ultimately the attackers were killed, defeated, or chased off,” Thomas said.

U.S. forces at al-Tanf, on Syria’s southern border with Jordan and Iraq, had initially withdrawn to avoid potential retaliatory action after the U.S. strike on an Assad regime airfield in western Syria.

The attack came from ISIS fighters disguised as U.S.-backed rebels, carrying M-16 rifles and using vehicles captured from U.S.-supported rebel groups. They struck first with a car bomb at the base entrance, which allowed some of the attackers to infiltrate the base. Many of the ISIS fighters were wearing suicide vests.

“Around 20 ISIS fighters attacked the base, and suicide bombers blew up the main gate, and clashes took place inside the base,” Tlass al-Salama, the commander of the Osoud al Sharqiya Army, part of the U.S.-backed moderate rebel alliance, told The Wall Street Journal.

Salama’s force sent reinforcements to the base, but they came under attack from other ISIS fighters.

Related: Mattis warns Syria against using chemical weapons again

U.S. special-operations forces and their Syrian partners who had moved out of the base quickly returned, and they initially repelled the attack on the ground in a firefight that lasted about three hours.

Coalition pilots also carried out multiple airstrikes amid the fighting, destroying ISIS vehicles and killing many of the terrorist group’s fighters.

“It was a serious fight,” a U.S. military official said April 10. “Whether or not it was a one-off, we will have to see.”

U.S. special-operations forces had been training vetted Syrian opposition troops at al-Tanf for more than a year. The Syrian opposition fighters in question were operating against ISIS in southern Syria and working with Jordan to maintain border security.

A fighter with the US-allied Syrian Democratic Forces sits atop a vehicle before a battle. (Photo from SDF via Facebook)

The pullback from al-Tanf to safeguard against reprisals was just one step the coalition took in the aftermath of the U.S. strike on Shayrat airfield, which was believed to be the launching point for a chemical weapons attack on a Syrian village April 4.

The coalition also reduced the number of air missions it flew, out of concern Syrian or Russian forces would attempt to shoot down U.S. aircraft. The U.S. presence in Syria has increased in recent months, as Marines and other units arrive to aid U.S.-backed fighters.

ISIS may become more active in southern Syria as U.S.-backed forces close in on Raqqa, the terrorist group’s self-proclaimed capital located in northeast Syria. Top ISIS leaders have reportedly fled the city in recent months.

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