( CNN ) -- Shouting condemnation and promises of retaliation , Syria , Iran and Hezbollah on Thursday condemned Israel 's decision to send warplanes into Syria , calling its airstrike a day before `` inhuman '' and `` barbaric . '' Russia also condemned Wednesday 's attack , saying it would represent an unprovoked violation of United Nations charter if confirmed . Syria 's Foreign Ministry summoned the commander of U.N. forces in the Golan Heights on Thursday to formally complain about the incident , while Iran 's deputy foreign minister , Hossein Amir Abdollahian , warned the attack would have `` dire consequences '' for Israel , according to Iran 's semiofficial Mehr News Agency . Just last week , Abdollahian warned that Iran would consider any attack on Syria as an attack on itself , Mehr reported at the time . Meanwhile , a U.S. official said reports that Israel had struck a Syrian research facility were wrong , instead saying warplanes hit only one target : a convoy carrying surface-to-air missiles . A source said Wednesday that Israeli fighter jets had struck a Syrian convoy suspected of moving Russian-made missile parts that could have been used to attack Israel . A senior U.S. official said the weapons were bound for the militant group Hezbollah in Lebanon . Syria and Iran back the group , which the United States has designated as a terrorist organization . World leaders seeks $ 1.5 billion for afflicted Syrians . However , Syria 's military said Wednesday and again Thursday in state-run media that Israel had struck at a defense research facility near the capital of Damascus , killing two workers and injuring five others . The report in Syrian state media tied the attack to Syria 's ongoing rebellion , saying Israel struck the site after repeated attempts by what the regime of Syrian President Bashar al-Assad refers to as terrorist groups failed to capture the facility . Experts say al-Assad 's regime is faltering after nearly two years of fending off the persistent rebellion , and a former high-ranking Israeli Intelligence official said Hezbollah probably wants to take hold of all the weapons it can before that happens . Providing Hezbollah with Syrian arms would better equip it to attack Israel , the official said . In recent years , Syria has transferred to Hezbollah Scud missiles that can carry chemical weapons . U.S. authorities say they do not believe the strike was linked to growing concerns about Syria 's chemical weapons , the senior U.S. official said Wednesday . The attack was not particularly surprising , said senior Brookings Institution fellow Michael O'Hanlon . `` At first glance , it likely wo n't be seen as a large escalation , though there 's still a possibility for retaliation . '' State Department spokeswoman Victoria Nuland and White House spokesman Jay Carney declined to comment on the airstrike Wednesday . Carney referred questions to Israel , which also has been tight-lipped about the strike . Teen refugee : Prince Charming is dead . On Thursday , Syria took its case against Israel to Maj. Gen. Iqbal Singh Singha , the commander of the United Nations Disengagement Observer Force in the Golan Heights , former Syrian territory seized by Israel in 1967 . Foreign Ministry officials demanded a U.N. response to the incident , which it said violates the U.N. charter and the 1974 agreement between Syria and Israel negotiated after the Yom Kippur War . U.N. Secretary-General Ban Ki-moon 's office issued a statement Thursday expressing `` grave concern '' about the incident , but said U.N. officials lacked details about exactly what had happened . Russia , a Syrian ally , said it also had `` grave concern '' about Wednesday 's airstrike . `` If the information is confirmed , we are dealing with unprovoked attacks on targets situated on the territory of a sovereign state that grossly violates the U.N. Charter and is unacceptable whatever motives are used to justify it , '' the Russian Foreign Ministry said Thursday . Iran also backed its close ally . The semiofficial Iranian Student News Agency quoted Foreign Minister Ali Akbar Salehi as saying the attack was `` in line with the West 's policies of undermining the victories of the Syrian government . '' Syria 's ambassador to Lebanon , Ali Abdul Karim , said Syria reserves the right to a `` surprise retaliation '' against Israel , according to Hezbollah 's official website , Moqawama . `` I can not predict this , and this depends on the relevant authorities to decide on appropriate retaliation and decide the manner and place , '' Moqawama quoted him as saying . CNN 's Saad Abedine contributed to this report .
NEW : United Nations secretary-general expresses `` grave concern '' about airstrike . Iran , Russia and Hezbollah condemn the attack . Syrian reports that strike hit research center are wrong , U.S. official says . Sources say the airstrike hit a convoy hauling missile parts .