MICHAEL R. GORDON, ERIC SCHMITT and DAVID E. SANGER
NY Times 
May 4, 2013
WASHINGTON — Israel aircraft bombed a target in Syria overnight Thursday, an Obama administration official said Friday night, as United States officials said they were considering military options, including carrying out their own airstrikes.
American officials did not provide details on the target of the Israeli strike. But in late January, Israel carried out airstrikes against SA-17 antiaircraft weapons, which the Israelis feared were about to be moved to the Hezbollah Shiite militia in Lebanon.
Israel has been worried that chemical weapons and advanced arms might be transferred to Hezbollah from Syria, and the Israeli military has made clear that it is prepared to take action to stop such shipments.
President Bashar al-Assad of Syria has long had a close relationship with Hezbollah, and Syria has been a gateway for shipping Iranian weapons to the militia.