Syria's army accused Israeli warplanes of hitting one of its positions Thursday, killing two people in an attack that a monitor said targeted a site where the regime allegedly produces chemical weapons.

Israel, without confirming it was behind the attack, indirectly warned Syria and its Shiite allies, which have gained the upper hand militarily in the country's war, that the Jewish state would do everything to prevent any "Shiite corridor from Tehran to Damascus".

The site near the Syrian town of Masyaf, between the central city of Hama and a port used by the Russian navy, is reportedly used by forces from Syria's allies Iran and the Lebanese Shiite militia Hezbollah.

Israel has previously carried out strikes believed to be targeting the transfer of weapons to its archfoe Hezbollah, which fought a devastating war with the Jewish state in 2006.

Thursday's strike hit a training camp and a branch of the Scientific Studies and Research Center (SSRC), an institution that Washington has accused of helping develop the sarin gas used in a deadly attack on the Syrian town of Khan Sheikhun in April.

President Bashar al-Assad's government has blasted such accusations as "fabrications," and Syria's army on Thursday did not mention the SSRC in its statement on the Israeli strikes.

"Israeli warplanes at 2:42 am today fired a number of missiles from Lebanese air space, targeting one of our military positions near Masyaf, which led to material damage and the deaths of two members of the site," the statement said.

"Syria's army warns of the serious repercussions of such acts of aggression on the security and stability of the region," it added.

- No 'Shiite corridor' -

The British-based Syrian Observatory for Human Rights monitoring group said the strikes hit the SSRC, though it could not confirm what weaponry is produced there.

"There are Iranian experts using the research centre there. Hezbollah also uses the facility," said Observatory head Rami Abdel Rahman.

"The research centre was definitely damaged in the strikes. There is a huge fire emanating from a weapons warehouse where missiles were being stored," he added.

Israel's Defence Minister Avigdor Lieberman issued a stern warning just hours after the air strike.

"We are determined to prevent our enemies harming, or even creating an opportunity to harm, the security of Israeli citizens," he said.

"We shall do everything in order not to allow the existence of a Shiite corridor from Tehran to Damascus."

And the head of Israeli military intelligence, Major General Herzl Halevi, issued a warning to the Jewish state's enemies "near and far".

"Our enemies in every arena know very well the combination of (our) precise intelligence and operational capabilities," Halevi said, also without directly referring to Syria.

Syria's foreign ministry in messages to the United Nations secretary general and the Security Council accused Israel of "protecting terrorists" by carrying out the strikes, state media reported.

"It is unacceptable that the Security Council has not yet taken any action to end these attacks," it added.

Earlier in Israel, former national security advisor Yaakov Amidror described the facility struck as a key centre for the research and development of arms including chemical weapons.

- Chemical attack -

He said Israel had made it clear that "we will not allow Iran and Hezbollah to build the capabilities which allow them to attack Israel from Syria."

"And we will not allow them to build the capabilities of Hezbollah under the chaotic umbrella of Syria."

Earlier this week, Israel's military began a massive exercise simulating conflict with Hezbollah, the largest drill in nearly two decades.

Hezbollah is a key ally of Assad's regime, and its fighters battle alongside the Syrian army.

Syria's government claims it no longer possesses chemical weapons after a 2013 agreement under which it pledged to surrender its chemical arsenal, following a chemical weapons attack outside the capital.

But in 2016, a UN-led investigative body said the Syrian government was behind at least three chemical attacks in northern Syria in the previous two years.

And on Wednesday, United Nations war crimes investigators announced they had an "extensive body of information" indicating Syrian warplanes were behind the deadly April 4 attack on Khan Sheikhun.

A fact-finding mission by the UN's chemical watchdog, the Organisation for the Prohibition of Chemical Weapons (OPCW), concluded earlier this year that sarin gas was used in the attack but did not assign blame.

The attack killed at least 87 people, according to the Observatory, and prompted the United States to launch a cruise missile strike on a Syrian military airport where it said the attack had originated.

Weeks later, the US sanctioned 271 Syrian chemists and other officials affiliated with the SSRC, which it said was behind the Syrian government's efforts to develop chemical weapons.

Source: AFP