NEW : Police , calls to aid Russian investigation . A Russian jetliner crashed on landing in the city of Kazan , killing all 50 aboard , authorities there reported Sunday . The Tatarstan Airlines flight had 44 passengers and a crew of six aboard . The Boeing 737 was flying from Moscow to Kazan when it crashed on landing . Security forces , regional governor 's son aboard the jet .
NEW : Police , calls to aid Russian investigation . The Tatarstan Airlines flight had 44 passengers and a crew of six aboard . The Boeing 737 was flying from Moscow to Kazan when it crashed on landing . Security forces , regional governor 's son aboard the jet .