An early-morning strike on a Syrian government air base in the country’s centre killed 14 fighters, including Iranian forces allied to the regime, a monitoring group said on Monday.
The US said it had not been involved in the attack.
“At least 14 fighters were killed in the strike on the T-4 airport, among them Iranian forces,” said the Syrian Observatory for Human Rights, a Britain-based war monitor.
Syrian state media had earlier reported dead and wounded in the strike, without giving casualty figures.
The T-4 base lies in Syria’s central Homs province and is also known as the Tiyas airport.
Forces from regime allies Russia and Iran, as well as fighters from the Tehran-backed Lebanese Hezbollah militia, are known to have a presence there, said Observatory chief Rami Abdel Rahman.
The Observatory, which has a wide network of sources across war-ravaged Syria, said it could not confirm who carried out the attack on the T-4 base
Israel carried out strikes against a Syrian government base in the country’s centre in February, with the Observatory identifying it at the time as T-4.
Israel has struck targets inside Syria on multiple occasions throughout the country’s seven-year war, including those linked to Iran and Hezbollah or to Assad’s chemical weapons programme.
The Russian Defence Ministry claimed Israel carried out the strike.
An Israeli military spokeswoman declined to comment.
The raid came as worldwide outrage mounted over a reported chemical weapons attack on a rebel-controlled town outside the Syrian capital.