Sources said the strikes targeted a large military research center.
A local health official quoted by the state news agency of Syria said 13 people were also wounded.
Two regional intelligence sources said several strikes hit a large military chemical weapons research center near Missyaf, believed to house a team of Iranian military experts involved in weapons production.
Syrian state media reported that the strikes caused two fires.
Recall that one such strike on the Iranian embassy in Syria on April 1, which killed the top commander of the elite Islamic Revolutionary Guard Corps (IRGC) and a senior commander, led to a massive Iranian attack on Israeli territory using attack drones and cruise missiles.
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