Russia has ordered the country’s airlines to stop using Tu-154B planes until the cause of a passenger jet fire and explosion that killed three people is determined.

Sergei Romanchev, a spokesman for the transport oversight agency, said airlines must obey the order. It was not immediately clear how many of the planes are in service in Russia.

The Tu-154B is one variant of the Tu-154 model, which has been in service since the early 1970s and has been in wide use on Russian internal flights and extensively in other countries, including Iran and former Soviet republics.

No cause has been determined for Saturday’s fire, which also injured 43 people. The fire began as the plane carrying 124 people taxied for takeoff at the airport in Surgut in western Siberia, about 1,350 miles east of Moscow. Frightened passengers clawed their way through the smoke-filled cabin and most managed to escape before the explosion.

Investigators have found the plane’s flight recorders and taken fuel samples and documents from the regional airline, Kogalymavia, that used the plane.