Plane crash likely resulted from icing TYUMEN, Russia, April 26 (UPI) -- A Russian passenger airliner likely crashed on takeoff April 2, killing 33 people, because it had not been deiced, a Russian Transport watchdog said Thursday. A spokesman for the watchdog Rostransnadzor told the Izvestiya newspaper weather had caused icing on the UTair ATR 72 plan but it did not undergo deicing, RIA Novosti reported. The flight bound for Surgut crashed on takeoff from Tyumen in Western Siberia, killing 32 people and severely injuring 11 others. Another passenger died in a hospital weeks after the crash. A Rostransnadzor investigation found a number of UTair planes had not been deiced. Rostransnadzor also found violations of working time, training failures and lapses in maintenance, RIA Novosti said. On April 9, Rostransnadzor issued a notice advising UTair against operating all ATR 72 variants. Rostransnadzor said the plane waited for its flight for about six hours overnight on the apron at Tyumen's Roshchino airport. It had been snowing and raining at the time. Two earlier fatal crashes of ATR 72 planes were attributed to icing, RIA Novosti said.