At least two U.S. service members were killed in action while defending against Iranian ballistic missile and drone attacks in Jordan, according to U.S. Central Command.

Another service member is missing after Friday’s attacks, according to the Department of Defense.

Four American service members were medically evacuated to Jordanian hospitals and have since been discharged, Central Command announced Saturday.

At least 15 U.S. service members have now died during the months-long war with Iran, including six people who were killed when two refueling jets collided above Iraq. An Iranian drone strike that hit a command post in Kuwait killed another six service members.

A Navy pilot died in a helicopter crash in the Arabian Sea earlier this month.

More than 400 troops have been wounded throughout the campaign.

This is a developing story