Officials released results Monday from an investigation into a plane crash that killed four people in Waskada in February 2013.

The Transportation Safety Board of Canada said the Cessna 210C left Waskada with the pilot and three passengers aboard for a sightseeing flight in the area around 12:30 p.m. on Feb. 10, 2013.

Fog moved into the area about half an hour later, said the TSB.

“The investigation determined that the terrain, coupled with the reported meteorological conditions, was conducive to whiteout, a winter atmospheric optical phenomenon in which the observer appears to be engulfed in a uniformly white glow,” said the TSB in a release on its website.

The TSB said the crash happened in an area of gently rolling hills.

“The Board therefore concluded that the pilot likely flew inadvertently into a whiteout, lost situational awareness and lost control of the aircraft, which resulted in an impact with terrain.”

37-year-old Darren Spence, his two sons Gage and Logan and their nine-year-old friend Dawson Pentecost died in the crash.