MOSCOW (AP) 鈥 Russian President Vladimir Putin on Saturday apologized to his Azerbaijani counterpart for what he called a 鈥渢ragic incident鈥 following the crash of an Azerbaijani airliner in Kazakhstan that killed 38 people, but stopped short of acknowledging that Moscow was responsible.

Putin's apology came amid mounting allegations that the plane had been shot down by Russian air defenses attempting to deflect a Ukrainian drone strike near Grozny, the regional capital of the Russian republic of Chechnya.

An official Kremlin statement issued on Saturday said that air defense systems were firing near Grozny airport on Wednesday. It did not explicitly say one of these hit the plane.

The statement said Putin apologized to Azerbaijani President Ilham Aliyev 鈥渇or the fact that the tragic incident occurred in Russian airspace.鈥

The readout said Russia has launched a criminal probe into the incident, and Azerbaijani state prosecutors have arrived in Grozny to participate. The Kremlin also said that 鈥渞elevant services鈥 from Russia, Azerbaijan and Kazakhstan are jointly investigating the crash site near the city of Aktau in Kazakhstan.

The plane was flying from Azerbaijan鈥檚 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. There were 29 survivors.

According to a readout of the call provided by Aliyev鈥檚 press office, the Azerbaijani president told Putin that the plane was subject to "external physical and technical interference," although he also stopped short of blaming Russian air defenses.

Aliyev noted that the plane had multiple holes in its fuselage and that the occupants had sustained injuries 鈥渄ue to foreign particles penetrating the cabin mid-flight.鈥

On Friday, a U.S. official and an Azerbaijani minister made separate statements blaming the crash on an external weapon, echoing those made by who blamed the crash on Russian air defense systems responding to a Ukrainian attack.

Passengers and crew who survived the crash told Azerbaijani media that they heard loud noises on the aircraft as it was circling over Grozny.

Dmitry Yadrov, head of Russia鈥檚 civil aviation authority Rosaviatsia, said Friday that as the plane was preparing to land in Grozny in deep fog, Ukrainian drones were targeting the city, prompting authorities to close the area to air traffic.

Yadrov said that after the captain made two unsuccessful attempts to land, he was offered other airports but decided to fly to Aktau.

Earlier in the week, Rosaviatsia had cited unspecified early evidence as showing that a bird strike led to an emergency on board.

In the days following the crash, Azerbaijan Airlines blamed 鈥減hysical and technical interference鈥 and announced the suspension of flights to several Russian airports. It didn鈥檛 say where the interference came from or provide any further details.

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