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The Jordanian military said in a statement that its air force “participated in precise airstrikes ... targeting several ISIS positions in southern Syria,� using a different abbreviation for the Islamic State group. Jordan is one of 90 countries making up the global coalition against IS, which Syria recently joined.

The U.S. military did not say how many had been killed in Friday’s strikes. The Syrian Observatory for Human Rights, a U.K.-based war monitor, reported that at least five people were killed, including the leader and members of an IS cell.

The Jordanian statement said the operation aimed “to prevent extremist groups from exploiting these areas as launching pads to threaten the security of Syria’s neighbors and the wider region, especially after ISIS regrouped and rebuilt its capabilities in southern Syria.�

U.S. Central Command, which oversees the region, said in a statement that its forces “struck more than 70 targets at multiple locations across central Syria with fighter jets, attack helicopters, and artillery,� with the Jordanian air force supporting with fighter aircraft.

It said that since the Dec. 13 attack in Syria, “U.S. and partner forces conducted 10 operations in Syria and Iraq resulting in the deaths or detention of 23 terrorist operatives,� adding that the U.S. and partners have conducted more than 80 counterterrorism operation in Syria in the past six months.

President Donald Trump had pledged “very serious retaliation� after the shooting in the Syrian desert, for which he blamed IS. Those killed were among hundreds of U.S. troops deployed in eastern Syria as part of a coalition fighting the militant group. On Friday Trump reiterated his backing for Syrian , who Trump said was “fully in support� of the U.S. strikes against IS.

IS has not taken responsibility for the attack on the U.S. service members, but the group has claimed two attacks on Syrian security forces since, one of which killed four Syrian soldiers in Idlib province. The group in its statements described al-Sharaa’s government and army as “apostates.� While al-Sharaa once led a group affiliated with al-Qaida, he has had a long-running enmity with IS.

As well as killing three U.S. citizens, the shooting near Palmyra also wounded three other U.S. troops as well as members of Syria’s security forces, and the gunman was killed.

The assailant had joined Syria’s internal security forces as a base security guard two months ago and recently was reassigned while he was under investigation on suspicions that he might be affiliated with IS, Syrian officials have said.

The man stormed a meeting between U.S. and Syrian security officials who were having lunch together and opened fire after clashing with Syrian guards.