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In this photo provided by Russia Emergency Situations Ministry press service, Russian emergency workers search the crash site of the ATR-72 plane crash outside Tyumen, a major regional center in Siberia, Russia, Monday, April 2, 2012. The passenger plane crashed shortly after take-off on Monday morning, killing 31 and leaving 12 survivors hospitalised in serious condition, Russian emergency officials. The French-Italian-made twin-engine turboprop ATR-72 plane was operated by UTair, flying from Tyumen to the oil town of Surgut with 39 passengers and four crew. (AP Photo/Russian Ministry of Emergency Situations press service)

In this photo provided by Russia Emergency Situations Ministry press service, Russian emergency workers search the crash site of the ATR-72 plane crash outside Tyumen, a major regional center in Siberia, Russia, Monday, April 2, 2012. The passenger plane crashed shortly after take-off on Monday morning, killing 31 and leaving 12 survivors hospitalised in serious condition, Russian emergency officials. The French-Italian-made twin-engine turboprop ATR-72 plane was operated by UTair, flying from Tyumen to the oil town of Surgut with 39 passengers and four crew. (AP Photo/Russian Ministry of Emergency Situations press service)

Dozens killed in Russian plane crash

April 2, 2012

Russia's civil aviation chief says the plane that crashed Apr. 2 into a snowy field in Siberia, killing 31 people, appears to have been improperly de-iced, but he said there was no indication that negligence had caused the crash.