(The Hill) — The Pentagon on Monday identified the three Army soldiers who were killed in a suicide drone attack in Jordan over the weekend.

All three soldiers served in the Army Reserve, according to the Pentagon, and were assigned to Georgia’s Fort Moore.

The soldiers are: Sgt. William Jerome Rivers, 46, of Carrollton, Ga.; Spc. Kennedy Ladon Sanders, 24, of Waycross, Ga.; and Spc. Breonna Alexsondria Moffett, 23, of Savannah, Ga.

Iranian-backed militia groups attacked Tower 22, a U.S. base in Jordan, in the early morning hours on Sunday with a suicide drone, which struck housing units.

This combination of photos provided by Shawn Sanders, left, and the U.S. Army, center and right, show from left to right, Spc. Kennedy Sanders, Sgt. William Jerome Rivers and Spc. Breonna Alexsondria Moffett. The three U.S. Army Reserve soldiers from Georgia were killed by a drone strike Sunday, Jan. 28, 2024, on their base in Jordan near the Syrian border. (Shawn Sanders and U.S. Army via AP)

Several media reports suggest the U.S. mistook the suicide drone for a friendly one set to return at that time, but the Pentagon has so far declined to officially explain what happened. The incident is under investigation.

The attack has the “footprints” of an Iranian-backed group in Iraq, Kata’ib Hezbollah, according to Pentagon deputy press secretary Sabrina Singh. She said the U.S. has not made a final determination.

Shortly after the attack, President Biden vowed to respond. Iranian-backed groups have battled U.S. forces across the Middle East since the breakout of the Israel-Hamas war.

As of Monday, Iranian-backed groups have attacked U.S. troops more than 160 times in Iraq, Syria and Jordan, while the Tehran-supported Houthis have launched more than 30 attacks on commercial vessels and American naval ships in the Red Sea.