Three American service members were killed and 25 others were wounded Sunday in a drone attack executed by Iranian-backed militants in Jordan.

“On Jan. 28, three U.S. service members were killed and 25 injured from a one-way attack UAS that impacted at a base in northeast Jordan, near the Syria border,” U.S. Central Command said in a statement. “As a matter of respect for the families and in accordance with DoD policy, the identities of the servicemembers will be withheld until 24 hours after their next of kin have been notified.”

The attack is the first that has resulted in the deaths of American soldiers since Iranian proxies started launching assaults on U.S. forces amid the geopolitical turmoil between Israel and Hamas.

“We know it was carried out by radical Iran-backed militant groups operating in Syria and Iraq,” President Biden said in a statement obtained by Politico.