The chief of an elite unit in Iran’s Revolutionary Guard has accused the U.S. of having “no will” to stop ISIS after the fall of the Iraqi city of Ramadi, an Iranian newspaper reported Monday.

The comments by Gen. Qassem Soleimani, the head of the Guard’s elite Quds unit, come just after U.S. Defense Secretary Ash Carter accused Iraqi forces of lacking the “will to fight” in an interview aired the day before.

It wasn’t clear whether Soleimani’s remarks came as a direct response to Carter’s, though tensions remain high between the two countries amid negotiations over Iran’s contested nuclear program.

The report in the daily newspaper Javan, which is seen as close to the Guard, quoted Soleimani as saying the U.S. didn’t do a “damn thing” to stop the extremists’ advance on Ramadi.

“Does it mean anything else than being an accomplice in the plot?” he reportedly asked, later saying the U.S. showed “no will” in fighting the Islamic State group.

Soleimani said Iran and its allies are the only forces that can deal with Islamic State group,

“Today, there is nobody in confrontation with (ISIS) except the Islamic Republic of Iran, as well as nations who are next to Iran or supported by Iran,” he said.

U.S. officials, including Carter, have said Iraqi forces fled the ISIS advance on Ramadi without fighting back, leaving behind weapons and vehicles for the extremists. So far, the American approach to the conflict has been to launch airstrikes as part of an international coalition it leads, as well as equipping and training Iraqi forces.

Iran has offered advisers, including Soleimani, to direct Shiite militias fighting against the extremists. Iran has said it does not have combat troops fighting in Iraq, though some Revolutionary Guard members have been killed there.

Meanwhile in Syria, activist said government warplanes conducted more than 15 air raids on the historic central town of Palmyra and nearby areas, leaving some dead or wounded.

The air raids on Palmyra came a day after the government said that Islamic State fighters have killed more than 400 state employees, troops and pro-government gunmen since they captured the town Wednesday.

The Britain-based Syrian Observatory for Human Rights and Osama al-Khatib, an activist from Palmyra who is now in Turkey, said the warplanes also struck an area near the town’s famous archaeological site, among the Mideast’s most spectacular.