Azerbaijan’s President Ilham Aliyev said Sunday that the Azerbaijani airliner that crashed last week was shot down by Russia, albeit unintentionally, and criticized Moscow for trying to “hush up” the issue for days.

"We can say with complete clarity that the plane was shot down by Russia. (...) We are not saying that it was done intentionally, but it was done,” he told Azerbaijani state television.

Aliyev said that the airliner, which crashed Wednesday in Kazakhstan, was hit by fire from the ground over Russia and “rendered uncontrollable by electronic warfare." Aliyev accused Russia of trying to “hush up” the issue for several days, saying he was “upset and surprised” by versions of events put forward by Russian officials.

“Unfortunately, for the first three days we heard nothing from Russia except delirious versions,” he said.

The crash killed 38 of 67 people on board. The Kremlin said that air defense systems were firing near Grozny, the regional capital of the Russian republic of Chechnya, where the plane attempted to land, to deflect a Ukrainian drone strike.

Russian President Vladimir Putin apologized to Aliyev on Saturday for what he called a “tragic incident” but stopped short of acknowledging Moscow’s responsibility.

The Kremlin also said a joint investigation by Russia, Azerbaijan and Kazakhstan has begun at the crash site near the city of Aktau in Kazakhstan. The plane was flying from Azerbaijan’s capital, Baku, to Grozny when it turned toward Kazakhstan, hundreds of kilometers (miles) across the Caspian Sea from its intended destination, and crashed while making an attempt to land.

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Associated Press writer Aida Sultanova in London contributed to this report.