MOSCOW: Investigators have recovered flight data recorders from the wreckage of a plane that crashed in Russia’s far east, killing 48 people, and will send them for analysis, Russian authorities said Friday.

The aircraft, an Antonov-24 operated by Angara Airlines, was making a second attempt to land in the remote Siberian town of Tynda when it disappeared from radar around 1:00 p.m. local time (0400 GMT) on Thursday.

A rescue helicopter later spotted the burning fuselage of the plane on a forested mountain slope about 15 kilometers (nine miles) south of Tynda’s airport.

Prosecutors have not commented on what may have caused the crash, but a rescuer quoted by the TASS news agency said the twin-propeller plane — almost 50 years old — was attempting to land in thick cloud.

Investigators are looking into whether the crash was caused by technical malfunction or human error, the agency reported.