The U.S. government suggested Friday that Russia may be to blame for this week’s deadly Azerbaijan Airlines crash, echoing experts’ assessment of the tragedy as investigations remain ongoing. Azerbaijan Airlines Flight 8243 was scheduled to travel from Baku,

Azerbaijan Airlines says the jet that crashed in Kazakhstan on Christmas Day experienced “physical and technical external interference,” according to an early investigation, as questions swirled about Russia’s possible involvement in the disaster.

The plane was diverted from Russia and had its GPS jammed before crashing in Kazakhstan, killing 38.