The officials cited a significant Turkish military buildup near Kobani, a Kurdish-majority city on the Syria-Turkey border.
In eastern Syria, there is a camp called Al-Hol, sometimes spelled al-Hawl, where many former ISIS members reside.
The source said they were optimistic that the new government might move towards peace with Israel.
While speaking to the committee of former National Security Council chief Yaakov Nagel, Katz warned of being taken in prematurely by the HTS group.
The country's new de facto leader, Ahmad al-Sharaa, faces a massive challenge to rebuild Syria.
NATO member Turkey backed the Syrian rebels who toppled President Bashar al-Assad last weekend.
An official said that additional Russian departures from the Hmeimim air base in Syria's Latakia province were expected in the coming days.
Jordan seeks to ensure regional security and stability, including in Syria, including by involving the international community in these prospects.
The main group in Ankara's cross-hairs is the Syrian Democratic Forces, or SDF, which was formed in 2015 with US backing.
The letter complained of Israeli strikes in the country - despite Israel targeting weapons facilities belonging to the Assad regime.
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