Syrian air defenses thwarted an Israeli missile attack on a research center and a military base in the northern province of Aleppo, state media said on Monday in the fifth such strikes in two weeks on suspected Iranian targets.
The Syrian army said in a statement that Israel hit military barracks in Safira in the eastern Aleppo countryside. Earlier, state television had said a research center was targeted.
The Britain-based Syrian Observatory for Human Rights reported another late Monday strike in the eastern Deir el-Zour province, which targeted positions of Iranian and Iran-backed fighters and killed, according to the report, 14 Iranian and Iraqi fighers. There was no immediate comment from Israel.
Syria’s state news agency reported Israeli strikes in the region of Safira, but did not mention the strikes on Deir el-Zour province, which borders Iraq.
An Israeli army spokeswoman declined to comment on the report.
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Western intelligence sources say Iranian-backed militias have long been entrenched in Aleppo province where they have bases and a command center, part of a growing presence across government-controlled Syria.
The Scientific Studies and Research Center is one of several facilities where Western intelligence and opposition sources suspect Syria with the help of Iranian researchers work on developing chemical weapons they accuse Syria of having used against civilians in rebel-held areas.
Damascus and its ally Moscow deny they have used chemical weapons that have killed hundreds of civilians in the course of the nine-year conflict and blame jihadist rebels for such attacks.Israel has previously struck several military research facilities believed to have been a centre for chemical and biological weapons.
On Friday, Israeli helicopters fired several rockets from the Israeli Golan Heights on targets inside southern Syria known to be a base for Lebanon's Hezbollah group, Syria and intelligence sources said.
The Syrian government does not say Iranian bases are targeted when it announces details of Israeli raids.
Major blasts in an ammunition depot near Homs city on the same day were also believed to be from an Israeli strike, a war monitor and intelligence sources said.
In April, an opposition war monitor said that an alleged Israeli airstrike in central Syria killed nine fighters, including six who were not Syrians and some who were loyal to Hezbollah.
The Syrian Observatory for Human Rights gave no nationalities for the foreigners who were killed on a military post in the desert near the historic central town of Palmyra.
Israel has acknowledged in recent years it has conducted many raids inside Syria since the start of the civil war in 2011 where it sees Iran's presence as a strategic threat.
Israeli defense minister Naftali Bennett told Israeli media last week that Israel would step up its campaign against Iran in Syria.
Separately, a regional intelligence source said Israeli jets are believed to have hit Iranian-backed militias entrenched in the border town of Albukamal near the border with Iraq where Iraqi Shi’ite paramilitary groups have a strong foothold.
The U.S. military last January struck Iran-backed militia groups in areas in Iraq and Syria along that border area in what U.S. officials then said was a response to escalating provocations from Iran. Iran's support alongside Russia has helped Syrian President Bashar Assad turn the tide against a military opposition that had seized large tracts of territory and sought to overthrow his authoritarian rule.
The Associated Press contributed to this report.