In the wake of reported Israeli air strike on a Syrian weapons center, Iran issued a threat to Israel on Thursday.
The Iranian regime's English language mouthpiece, Press TV, quoted a deputy foreign minister as saying that the "strike on Syria will have serious consequences for Tel Aviv." The official did not elaborate.
Last week, the AP quoted a senior adviser to Iran's supreme leader as saying that any attack on Syria would be seen by Tehran as an attack on itself.
The official, Ali Akbar Velayati, said the regime of Basher Assad is a central component of the "resistance front."
Meanwhile, Lebanon's militant group Hezbollah condemned on Thursday an Israeli attack which it said targeted a Syrian research center, saying it was an attempt to thwart Arab military capabilities and pledging to stand by its ally President Bashar Assad.
"Hezbollah strongly condemns this new Zionist aggression on Syria,” the group said in a statement, calling for "wide-scale condemnation from the international community," the group said in a statement.
The group "expressed its full solidarity with Syria's leadership, army and people."
Sources said on Wednesday that Israel Air Force jets bombed a convoy near Syria's border with Lebanon, apparently targeting weapons destined for Hezbollah. Syria denied the reports, saying the target had been a military research center.
Russia said on Thursday it was very concerned about reports of an Israeli air attack deep inside Syria near Damascus and that any such action, if confirmed, would amount to unacceptable military interference in the war-ravaged country.
"If this information is confirmed, then we are dealing with unprovoked attacks on targets on the territory of a sovereign country, which blatantly violates the UN Charter and is unacceptable, no matter the motives to justify it," the Russian Foreign Ministry said in a statement.
Syrian state television accused Israel of bombing a military research center at Jamraya, between Damascus and the nearby border. Syrian rebels disputed that, saying their forces had attacked the site.
Russia has been trying to shield Syrian President Bashar Assad from international pressure to end the civil war against opposition forces that has ravaged the country over 22 months and killed an estimated 60,000 people. Moscow has repeatedly spoken against any foreign interference in Syria, especially military action.

By YAAKOV LAPPIN, JPOST.COM STAFF. Reuters contributed to this report.