As the US weighed the Syria attack scenario, President Barack Obama has gone to the Congress for approval of a military strike, Israel tested a US-backed missile system in the Mediterranean on Tuesday but did not announce the launch in advance, prompting a disclosure by Russia that kept the world on edge .
The morning launch was first reported by Moscow media that quoted Russian defence officials as saying two ballistic "objects" had been fired eastward from the centre of the sea, which is roughly in the direction of Syria.
The news ruffled financial markets until Israel's Defence Ministry said that it, along with a Pentagon team, had carried out a test-launch of a Sparrow missile. The Sparrow, which simulates the long-range missiles of Syria and Iran, is used for target practice by Israel's U.S.-backed ballistic shield Arrow.
"Israel routinely fires missiles or drones off its shores to test its own ballistic defence capabilities," a U.S. official said in Washington.
Western naval forces have been gathering in the Mediterranean and the Red Sea since President Bashar al-Assad was accused of carrying out an August 21 gas attack in his more than two-year-old conflict with rebels trying to topple him.
Damascus denies responsibility for the incident. U.S. President Barack Obama had been widely expected to order reprisal strikes on Syria last week but put them off to seek support from Washington lawmakers first.
With U.S. action on Syria delayed as Obama confers with Congress, Israeli Prime Minister Benjamin Netanyahu has sought to play up the Jewish state's ability to deal with its foes alone. On Tuesday, the rightist premier spoke of anti-missile systems as a national "wall of iron".
"These things give us the power to protect ourselves, and anyone who considers harming us would do best not to," he said in a speech.
Israeli Defence Minister Moshe Yaalon shrugged off a question from reporters on whether the launch might have been ill-timed. He said Israel had to work to maintain its military edge and "this necessitates field trials and, accordingly, a successful trial was conducted to test our systems. And we will continue to develop and to research