A military airbase belonging to the Assad regime near the Syrian city of Homs was hit with missiles overnight Sunday, local media reported.
Syrian media reported that the strike killed fourteen people, including Iranian citizens.
Loud explosions were reported near the T-4 airfield, according to the reports. Syria's air defenses fired back and shot down eight missiles, the reports said.
Syrian television also reported that several people were killed and injured in the attack, but did not provide further details.
News of the air strike came hours after U.S. President Donald Trump warned Damascus and its allies that there would be a "big price to pay" after a suspected chemical attack in Syria over the weekend.
The Pentagon, however, told Sky News that they had "nothing to confirm". Several U.S. officials quoted by Reuters said there was no truth to reports that the U.S. military had launched the air strikes.
The air strike on the Syrian base also came just after U.S. officials said the assessment in Washington is that chemical weapons were indeed used in the attack on the besieged rebel-held town of Douma.
Various sources have suggested that Israel may be responsible for the attack, which the Russian army claims that two Israeli planes carried out.