The regional officials said the shipment Israel was planning to strike included Russian-made SA-17 anti-aircraft missiles, which would be strategically “game-changing” in the hands of Hezbollah by enabling the group to carry out fiercer attacks on Israel and shoot down Israeli jets, helicopters and surveillance drones. Hezbollah has committed to Israel’s destruction and has gone to war against the Jewish state in the past. A U.S. official confirmed the strike, saying it hit a convoy of trucks. All officials spoke on condition of anonymity because they were not authorized to discuss the strike. The Israeli military declined to comment. Syria has long been among the militant group’s most significant backers and is suspected of supplying with funding and arms, as well as a land corridor to Iran. This strike, however, comes as Assad is enmeshed in a civil war with rebels trying to oust him. The rebels have seized a large swath of territory in the country’s north and established footholds in a number of suburbs of the Syrian capital, Damascus, though Assad’s forces still control the city and much of the rest of the country. While Assad’s fall does not appear imminent, analysts worry he could grow desperate as his power wanes and seek to cause trouble elsewhere in the region through proxy groups like Hezbollah. The Syrian army statement denied that the strike had targeted a convoy headed from Syria to Lebanon, instead portraying the strike as linked to the civil war pitting Assad’s forces against rebels seeking to push him from power. “This proves that Israel is the instigator, beneficiary and sometimes executor of the terrorist acts targeting Syria and its people,” the statement said. The location could not be independently confirmed because of reporting restrictions in Syria. Syria’s government portrays the crisis, which started with political protest in 2011 and has since become a civil war, as a foreign-backed conspiracy meant to destroy the country. Top Israeli officials have recently expressed worries that if desperate, Assad’s regime could pass chemical weapons to Hezbollah or other militant groups.