Missile strikes overnight in central Syria’s Hama province killed at least 26 pro-regime fighters, most of them Iranians, the Syrian Observatory for Human Rights said Monday. It said the missiles hit a military base late Sunday, in an assault that bore Israel’s hallmarks. "At least 26 fighters were killed, including four Syrians," the monitor said, adding that the main target of the missile strike was the base of the regimes 47th Brigade. "The others are foreign fighters, a vast majority of them Iranians," said Rami Abdel Rahman, the head of the Britain-based war monitor. However, Irans Tasnim news agency said reports of Irans base in Syria being hit by rockets were baseless and no Iranians had been killed. According to the Observatory, the death toll could rise as the attack also wounded 60 fighters and there were several others still missing. "Given the nature of the target, it is likely to have been an Israeli strike," Abdel Rahman said, adding that strikes also hit an air base in nearby Aleppo province where surface-to-surface missiles were stored. Syrian regime media late Sunday had denounced a "fresh aggression" following reported raids by "enemy missiles". Israeli Intelligence Minister Yisrael Katz told army radio on Monday morning that he was "not aware" of the latest strikes. But, he said, "all the violence and instability in Syria is the result of Irans attempts to establish a military presence there. Israel will not allow the opening of a northern front in Syria." Meanwhile, Syrian regime forces began an intense bombardment of a rebel enclave near Homs on Monday, the Observatory said. The assault on the pocket between Homs and Hama - the most populous remaining besieged area in Syria - included both air strikes and artillery, said the war monitor. Reinforcements had arrived in regime-held areas before the bombardment, which targeted Rastan, the biggest town in the pocket, and several nearby villages, the Observatory said. Syrian rebels hold large swathes of both northwest and southwest Syria. An alliance of Kurdish and Arab militias backed by the United States holds large parts of northern and eastern Syria after an offensive against ISIS last year.