A Syrian local source said the crash took place on December 31, 2017.
The attack would mark the single biggest loss of military hardware for Russian Federation since it launched air strikes in Syria in 2015. More than 10 servicemen were wounded in the shelling by "radical Islamists", the report said.
Citing the Russian Defense Ministry, the agency said "a Russian military Mi-24 helicopter crashed in Syria due to a technical malfunction".
The incident took place on December 31, when the "Russian Mi-24 helicopter crashed while making a hard landing" 15 km from Hama airfield, the ministry said in a statement.
"It is now unknown whether the helicopter was escorting a humanitarian convoy or a combat unit", the CIT said.
Russia's Defence Minister Sergei Shoigu last month said the military had completed the partial withdrawal from Syria ordered by President Vladimir Putin, but Russian Federation will maintain a presence in the country, including three battalions and two bases.
In a message to Syrian President Bashar al-Assad, Putin said Russian Federation would continue to support Syria.
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