Sgt. William Nathaniel Howard, 29, and Sgt. Edgar Brian Torres-Tovar, 25, were killed by a "lone ISIS gunman," according to the U.S. military.

President Donald Trump vows "very serious retaliation" after an ISIS gunman killed two U.S. Army soldiers and an interpreter in a Syrian ambush, leaving three other soldiers wounded.

Syria's government said it arrested five people on Sunday following the attack that killed three Americans and wounded several others, but it has offered no clarity about how the gunman was able to approach what should have been a secure meeting.

The U.S. Army has shared the identities of the two Iowa National Guard troops who were killed on Saturday when an ISIS terrorist opened fire on them in Palmyra, Syria. Sgt. Edgar Brian Torres Tovar, 25,

Syria and Iraq held talks on Monday to explore ways to improve border crossing operations and further strengthen cooperation between

President Trump said there would be “very serious retaliation” for the attack, which also killed an American interpreter.

The gunman who killed two U.S. soldiers and an American civilian interpreter had been set to be dismissed from the security forces over his extremist views, U.S. and Syrian officials said.

The shooting happened during a mission by U.S. and Syrian forces in a historic central town near Palmyra on Saturday. President Trump and U.S. military officials attributed the attack to ISIS.

Iraq’s interior ministry on Monday denied claims that a project to merge the national identification card with the residency card had been awarded to a Syrian company. A lawmaker claimed the company is linked to Syria’s interim President Ahmad al-Sharaa.

The killing of three Americans during what was said to be a counterterrorism operation in central Syria served as a reminder that U.S. troops are still operating in the country.