Prime Minister Benjamin Netanyahu on Sunday led a chorus of Israeli officials expressing outrage over the bloodshed in Syria, accusing Iran and Lebanese Hezbollah militants of complicity in the carnage there.

Israel is anxiously watching developments in the neighboring country, fearing widening instability in the region. With dozens killed in ferocious weekend battles, a string of top Israeli officials sounded alarms over the deteriorating situation in Syria and called for international intervention.

Netanyahu accused Syria's powerful, anti-Israel allies of helping the regime of President Basher Assad to brutally suppress the 15-month-old rebellion.

"This massacre is not executed by the Syrian government alone; it is assisted by Iran and Hezbollah, and the world should realize this is a concentrated axis of evil: Iran, Syria and Hezbollah," Netanyahu said at the start of the weekly Cabinet meeting.