May 2013 Rif Dimashq Airstrikes

By early 2013, the Syrian civil war had created conditions that Israeli officials viewed as a serious strategic threat: the possible transfer of advanced weapons systems from Syrian government stockpiles, or from Iranian shipments transiting Syria, to Hezbollah in Lebanon. The May attacks occurred amid Israel's limited military involvement in Syria beginning earlier that year, including retaliatory strikes following artillery fire at Israeli positions in the Golan Heights.[2][4]

Israel's stated red line centered on the transfer of what officials called "game-changing" weaponry to Hezbollah. Israeli ambassador Michael Oren articulated the position publicly: "If the Syrian regime tries to transfer chemical weapons, or what we call game changing weaponry, to terrorist organizations, particularly to Hezbollah in Lebanon, Israel will not remain passive."[1] The weapons most frequently cited in reporting on the May strikes were Iranian-made Fateh-110 surface-to-surface missiles, described by Israeli officials as having a range of 300 kilometers (190 miles), a 600-kilogram (1,300-pound) explosive payload, and reported accuracy of 200 meters (650 feet).[2] Israeli officials also suspected that targeted warehouses contained Russian Yakhont shore-to-sea cruise missiles, although that target remained unconfirmed.[2]

Reports described an initial strike between Thursday evening and Friday morning, dated variously as May 2–3, targeting warehouses at Damascus International Airport.[1][2] Accounts differed over what was struck: U.S. officials told NBC News the target was likely related to chemical-weapons delivery systems destined for Hezbollah, while The New York Times reported Fateh-110 surface-to-surface missiles stored at the airport.[1] The Israel Terrorism Information Center, summarizing a New York Times account based on American officials, reported that the shipment had been sent from Iran to Hezbollah, stored in an airport warehouse, and secured by Hezbollah and Iranian Qods Force operatives.[5] Satellite images released by Israeli Channel 2 on May 15 and dated May 6 showed at least two locations on opposite sides of the airport complex that appeared to have been completely destroyed.[6]

A second wave of strikes was reported during the night of May 4–5 and described as the second attack within 48 hours.[7] Syrian state television said explosions struck the Jamraya military research facility outside Damascus, which had also been attacked in January 2013.[7] The facility was described as possibly involved in biological and chemical weapons development.[8] A congressional testimony timeline listed additional May 5 targets: Syrian Republican Guard artillery emplacements on Mount Qasioun, the 104th and 105th Republican Guard Brigades and a 14th Special Forces Division ammunition warehouse at Al-Hamah, and sites at Al-Dimas, Qadsiya, Al-Saboura, and Jamraya where an SA-17 surface-to-air missile system or surface-to-surface missiles were believed to have been targeted en route to Hezbollah.[9]

The aircraft involved in the earlier strike reportedly did not enter Syrian airspace, while a Free Syrian Army figure said six sites were struck from within Syrian airspace; the differing flight-path accounts were not reconciled.[1][7] Residents near the Jamraya military base, about 10 miles from Damascus, described the explosions by saying that "night turned into day."[10] Israeli forces subsequently deployed two Iron Dome batteries in northern Israel and temporarily closed northern airspace, reopening it Monday.[10] A TIME correspondent hiking on Mount Meron heard sirens several times at an IDF air base on Saturday morning; military sources said the sirens summoned personnel to action stations in preparation for possible Syrian retaliation.[2]

Reported casualties from the May 5 strikes differed sharply and were not independently verified. The Syrian Observatory for Human Rights reported at least 42 soldiers killed in the Sunday attack, noting that about 150 soldiers were normally stationed in the targeted area but that the number present at the time was unclear.[11] Channel 10 reported two Syrian fatalities and about a dozen injured.[11] An unnamed Syrian military official told The New York Times that "dozens of elite troops" had died, while a doctor at Tishreen military hospital reportedly said there were at least 100 dead soldiers and many more wounded.[11][12] An RT-cited Syrian military official called the military losses "negligible" and said valuable equipment had been removed after the earlier strike.[12] Syria's Foreign Ministry stated only that several people had been killed and wounded.[13]

One CAMERA report relayed a New York Times claim, cited by BBC correspondent Jeremy Bowen, that "perhaps even hundreds of regime soldiers were killed in the raid," although this figure was not independently established.[14] For the May 2–3 airport strike, the congressional testimony timeline reported no casualties and presented the target and its contents as believed rather than confirmed.[9] In a letter to the United Nations and Security Council, the Syrian Foreign Ministry said the "Israeli aggression… caused widespread destruction."[13]

Syria's government characterized the strikes in the strongest terms. Deputy Foreign Minister Faisal Mekdad called the attacks a "declaration of war," and the government described them as a violation of international law.[10] Syrian Foreign Ministry statements identified three military sites as struck: the Jamraya research center, a paragliding airport in the al-Dimas area, and a site in Maysaloun. CAMERA characterized the government's accompanying allegations of coordination between Israel, terrorist groups, and the al-Nusra Front as regime propaganda.[15] Syria's ambassador to the United Nations, Bashar Ja'afari, initially said: "I'm not aware of any attack right now."[1]

Condemnations came from Egypt, Lebanon, and the Arab League, which called for international action and emphasized Syrian sovereignty.[13] Egypt condemned the reported attacks while also noting that its government sided with those rebelling against Assad.[13] Iran denied that the strikes targeted missiles intended for Hezbollah and offered support to Syria.[13] Lebanese and UNIFIL security measures were increased in anticipation of possible military developments, and Lebanon's National News Agency reported increased Israeli troop mobilization along the southern Lebanese border.[16]

In a May 9 speech, Hezbollah leader Hassan Nasrallah said one purpose of the strikes was to prevent "game-changing" weapons from reaching Hezbollah. He claimed that the Syrian regime had decided to provide Hezbollah with "a high quality weapon it had not yet received," without identifying the weapon.[5] A senior Hezbollah figure, reported by Al-Ra'i TV on May 24, threatened: "Every strike on an airport will be answered with a strike on an airport and train stations [in Israel]," adding: "Thus both we and our enemy will simultaneously return to the Stone Age."[5] A separate senior Hezbollah source denied that the targeted weapons belonged to Hezbollah.[12]

The White House declined to confirm or deny Israeli responsibility. Press Secretary Jay Carney said at a May 6 briefing that Israel "certainly has the right to be concerned about the transfer of sophisticated weapons to Hezbollah" and had the right to act in its sovereign interest, while referring operational questions to the Israeli government.[3] State Department spokesman Patrick Ventrell similarly declined to say whether the strikes breached Syrian sovereignty and said he had no casualty information, while confirming ongoing U.S.-Israel contact across military, intelligence, and diplomatic relationships.[17] A senior U.S. official separately confirmed to NBC News that Israel carried out the Saturday strike.[1] President Barack Obama was quoted as saying: "The Israelis, justifiably, have to guard against the transfer of advanced weaponry to terrorist organizations like Hezbollah."[18]

The strikes formed part of a broader pattern of limited Israeli military involvement in Syria. A Congressional Research Service report described Israel as having allegedly conducted three separate airstrikes in February and May 2013 to prevent Hezbollah from controlling or using sophisticated missiles or anti-aircraft weapons.[4] A congressional testimony timeline listed four separate May entries—one for May 2–3 and three for May 5—without explaining the difference in how the incidents were counted.[9]

Nearly every significant operational detail remained disputed or unconfirmed in contemporaneous reporting. Israel did not officially acknowledge responsibility, and Defense Ministry official Amos Gilad disputed that any official confirmation had been issued, even as anonymous Israeli officials described raids on advanced-missile shipments.[1][2] Accounts variously identified Iranian Fateh-110 missiles at Damascus International Airport, chemical-weapons delivery systems, the Jamraya research facility, Republican Guard bases, security facilities, and artillery positions on Mount Qasioun.[1][7] The Combating Terrorism Center described the May 3 shipment as "sophisticated anti-aircraft weaponry" and identified it as "probably" Fateh-110, although other sources consistently described the Fateh-110 as a surface-to-surface missile.[8]

Reported performance figures for the Fateh-110 also differed: one account gave a 300-kilometer range and 200-meter accuracy, while another described a range of 185 miles and accuracy within 330 feet.[2][10] The sources did not establish independently whether all of the targeted materiel was destroyed, and casualty figures ranged from two dead to reports of more than one hundred, with no verified total.[14][11] The attacking aircraft's exact flight paths—whether they operated from Lebanese or Syrian airspace—were similarly contested and unresolved.[7]