Passage: The Russian Interstate Aviation Committee (IAC) opened an investigation into the accident. President Vladimir Putin also set up a special commission to investigate the crash. Within the first few hours of the investigation, the Ministry of Transport announced two theories regarding the crash — weather conditions and human factors.The wreckage of Flight 703 was scattered over a wide area. Officials stated that the radius of the crash site area was about one kilometer, which added suspicion that the aircraft possibly had disintegrated in mid-flight. Since a witness stated it was in flames during its descent, a bomb theory was put forward by several investigators. Both flight recorders (the flight data recorder and the cockpit voice recorder) were found on 12 February.Saratov Airlines' documents related to the aircraft were impounded as part of the routine investigation. The crash has also caused the Russian Emergency Ministry to discuss whether all Antonov An-148s should be grounded temporarily. Personnel at Moscow Domodedovo Airport were also interviewed.Russian news agency Rambler News Service (RNS) reported that the pilot of Flight 703 had declined to have the aircraft de-iced before the departure. According to a METAR weather report, the weather at 11:00 included snow showers and a temperature of −5°C at Domodedovo Airport.On 13 February, the IAC reported that initial analysis of data from the flight data recorder showed that the pitot tube heaters were not turned on and there were discrepancies in the airspeeds being displayed to the pilots, with one airspeed indicator showing increasing airspeed, one showing decreasing airspeed and the third showing no airspeed. The data also showed that the aircraft was under manual control when it pitched nose down some 30° below the horizontal and remained in that attitude until it impacted the ground. The first officer tried to stop sharp descent, but failed to persuade the captain of the loss of control.

Question: What does IAC stand for?
Interstate Aviation Committee