NEW : Wreckage of the plane has been reported , a local official says . The Sukhoi Superjet 100 was on a multination ##s tour . The plane started to descend and then disappeared off radar screens . A Sukhoi representative says 40 passengers and eight crew members were on board .
NEW : Wreckage of the plane has been located , a local official says . The Sukhoi Superjet 100 was on a multination demonstration tour . The plane started to descend and then vanished off radar screens . A Sukhoi representative says 42 passengers and eight crew members were on board .