ROCKY MOUNTAIN HOUSE, Alta. - Two young girls have been killed and another injured in a farm accident near Withrow, Alta.

Rocky Mountain House RCMP say the three girls were playing on a loaded truck of canola at a family farm on Tuesday evening.

However, they became buried by the seed in the truck and started to suffocate.

EMS officials say the first arriving ambulance from Eckville determined the three girls had been inside the truck while it was being filled from a hopper but say it is unclear how they became submerged underneath the seed.