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investigators were scrambling Wednesday to determine the cause of a crash that killed all 176 people on board a plane that came down shortly after takeoff from Tehran's international airport.
The Boeing 737 jet, operated by Ukraine International Airlines, took off early on Wednesday en route to the Ukrainian capital Kiev with 167 passengers and nine crew on board.
Earlier reports from Iranian state media had said 180 people were on board Flight PS752.
Eighty-two Iranians, 63 Canadians, and 11 Ukrainians died in the crash, according to a tweet from Ukrainian foreign minister Vadym Prystaiko.