"[Various] versions of the Airbus crash are being considered, but one of the main ones is a technical fault with the plane," the Prosecutor General's Office said.
Rescuers said 102 people had been killed and 54 injured after the Airbus A-310 overshot the runway in Irkutsk and hit a wall. It then burst into flames.
Sibir Airlines, which owned the plane, said there were 192 passengers on board and eight crewmembers. Fifty-four people are being treated in the hospital.
Irkutsk, 5,000 kilometers (3,100 miles) east of Moscow, is the main airport for holidaymakers heading for Lake Baikal, a popular destination for Russians in the summer.
Transportation Minister Igor Levitin, who has been appointed the head of a government commission into the tragedy, said the runway was wet after rain, but an official from the Emergency Situations Ministry said the landing gear may have caught fire as the plane landed.
On May 3, an Armenian A-320 crashed in the Black Sea killing all 113 people on board.
In 2001, a Russian-made airliner crashed near Irkutsk with the loss of all 145 passengers and crew
