The extraction of flight data from the Brazilian-made Azerbaijan Airlines in Kazakhstan last month was completed at a lab run by Brazil's air force, according to a statement released by the entity on Monday.

Mobile phone footage circulating online appeared to show the Azerbaijani Airlines plane making a steep descent before slamming into the ground in a fireball in western Kazakhstan.

The Embraer 190 was traveling to Grozny, Russia, but crashed near Aktau, Kazakhstan, killing 38 people onboard. Investigators are focusing on Russian air defense as the likely cause.

Azerbaijan Airlines’ Embraer 190 was en route from the Azerbaijani capital of Baku to Grozny in the North Caucasus on Wednesday when it was diverted. It crashed while trying to land near the city of Aktau, Kazakhstan, after flying hundreds of kilometers (miles) east across the Caspian Sea.

Azerbaijan Airlines flight J2-8243 caught fire as it tried to make an emergency landing in Aktau, southwestern Kazakhstan, on Wednesday. It was traveling from the Azeri capital Baku to Grozny, the capital of the Russian republic of Chechnya.

Dozens of people have died after a passenger plane crashed with about 70 people on board in Kazakhstan, local officials say. Authorities in Azerbaijan, where the flight originated, say there were at least 30 survivors. Azerbaijan Airlines flight J2-8243 caught fire as it attempted to make an emergency landing near the Kazakh city of Aktau.

Flight records for the plane made by Brazil's Embraer that crashed last week in Kazakhstan are headed to the South American country so the data can be extracted, the Brazilian Air Force said in a statement on Monday.

On Christmas Day, a plane traveling from Baku, Azerbaijan, to Grozny, Russia, crashed in Kazakhstan, killing over half of its passengers. Theories abound regarding why the plane made an emergency landing near the Kazakhstani city of Aktau.

In the crash’s aftermath, Azerbaijan has unleashed rare and stinging criticism of Russia, with the country’s president saying Moscow’s response has caused “surprise, regret and rightful indignation.”