(AP) -- An Azerbaijani airliner has crashed in Kazakhstan after being diverted, killing 38 of 67 people on board. Some things to know about the crash and the speculation about a possible cause: How did the plane crash? Azerbaijan Airlines’ Embraer 190 was en route from Azerbaijani capital Baku to the Russian city of Grozny in the North Caucasus on Wednesday when it was diverted for reasons that aren't fully clear yet. It crashed while making an attempt to land in Aktau, Kazakhstan, after flying east across the Caspian Sea. The wreckage of Azerbaijan Airlines Embraer 190 lays on the ground near the airport of Aktau, Kazakhstan, Wednesday, Dec. 25, 2024. (AP Photo/Azamat Sarsenbayev)Los restos del avión Embraer 190 de Azerbaijan Airlines yacen en el suelo cerca del aeropuerto de Aktau, Kazajstán, miércoles 25 de diciembre de 2024. (AP foto/Azamat Sarsenbayev)In this photo released by Kazakhstan's Emergency Ministry Press Service, rescuers work at the wreckage of Azerbaijan Airlines Embraer 190 lies on the ground near the airport of Aktau, Kazakhstan, Thursday, Dec. 26, 2024. (Kazakhstan's Emergency Ministry Press Service via AP)In this photo taken from a video released by the administration of Mangystau region, a part of Azerbaijan Airlines' Embraer 190 lies on the ground near the airport of Aktau, Kazakhstan, on Thursday, Dec. 26, 2024. (The Administration of Mangystau Region via AP)St. Petersburg Governor Alexander Beglov lays a bunch of flowers at the Consulate of Azerbaijan in the memory of victims of the Azerbaijan Airlines' Embraer 190 that crashed near the Kazakhstan's airport of Aktau, in St. Petersburg, Russia, Thursday, Dec. 26, 2024. (AP Photo/Dmitri Lovetsky)Flowers and portraits are placed at the Consulate of Azerbaijan in the memory of victims of the Azerbaijan Airlines' Embraer 190 that crashed near the Kazakhstan's airport of Aktau, in St. Petersburg, Russia, Thursday, Dec. 26, 2024. (AP Photo/Dmitri Lovetsky)In this image taken from video released by the Russian Emergency Ministry Press Service, rescuers transport wounded passengers from a medical plane after the Azerbaijani Airline crashed, near the Kazakhstani city of Aktau, upon their arrival at the Zhukovsky airport outside Moscow, Russia, on Thursday, Dec. 26, 2024. (Russian Emergency Ministry Press Service via AP) The plane went down near the coast about 3 kilometers (around 2 miles) from Aktau. Cellphone footage circulating online appeared to show the aircraft making a steep descent before hitting the ground and exploding in a fireball. Rescuers have rushed 29 people who survived the crash to hospitals. How did Azerbaijan react? Azerbaijan observed a nationwide day of mourning on Thursday. National flags were lowered across the country, traffic across the country stopped at noon, and signals were sounded from ships and trains. Speaking at a news conference Wednesday, Azerbaijani President Ilham Aliyev said that the weather had forced the plane to change from its planned course. What do they say about a possible cause? Kazakhstani, Azerbaijani and Russian authorities say they are investigating the crash. Embraer told The Associated Press in a statement that the company is “ready to assist all relevant authorities.” Russia’s civil aviation authority, Rosaviatsia, said that preliminary information indicated that the pilots diverted to Aktau after a bird strike led to an emergency on board. Some commentators alleged that the holes seen in the plane’s tail section pictured after the crash possibly indicate that it could have come under fire from Russian air defense systems fending off a Ukrainian drone attack. Body found in wheel well of United Airlines flight to Hawaii Osprey Flight Solutions, an aviation security firm based in the United Kingdom, warned its clients that the “Azerbaijan Airlines flight was likely shot down by a Russian military air-defense system.” Osprey CEO Andrew Nicholson said that the company had issued more than 200 alerts regarding drone attacks and air defense systems in Russia during the war. Asked Thursday about the claims that the plane had been fired upon by air defense assets, Kremlin spokesman Dmitry Peskov told reporters that “it would be wrong to make hypotheses before investigators make their verdict.” Officials in Kazakhstan and Azerbaijan have similarly avoided comment on a possible cause of the crash, saying it will be up to investigators to determine it.