UN Secretary-General Ban Ki-moon has voiced "grave concern" at reported Israeli air strikes on Syria, and called on all sides to "exercise maximum calm and restraint".
"The secretary-general expresses grave concern over reports of air strikes in Syria by the Israeli Air Force," Xinhua quoted a statement issued by Ban's spokesman as saying.
"At this time, the United Nations does not have details of the reported incidents," the statement said.
"Nor is the United Nations in a position to independently verify what has occurred," it added.
Media reports said Syria has deployed missile defence batteries towards Israel in response to the Israeli attack that targeted a Syrian army facility in the capital city of Damascus Sunday.
Syria's state media accused Israel of trying to give a boost to the Syrian rebels. The Israeli government has so far made no official comment on the reported attack.
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The UN statement added: "The secretary-general calls on all sides to exercise maximum calm and restraint, and to act with a sense of responsibility to prevent an escalation of what is already a devastating and highly dangerous conflict."
"The secretary-general urges respect for national sovereignty and territorial integrity of all countries in the region, and adherence to all relevant Security Council resolutions," it said.