Three people were taken to hospital after an explosion at an industrial wood pellet plant about 100 kilometres west of Edmonton.
Parkland County officials say several emergency vehicles were sent to the Pinnacle Renewable Energy plant in Entwistle around 2:30 p.m. Monday.
A woman who works at the plant tells CTV News that her son, who is also on staff, was helping another employee put out a fire when she heard a blast.
She says both people suffered head injuries, but her son was conscious and breathing when he was airlifted to Edmonton.
County fire Chief Brian Cornforth said there was no immediate indication of what caused the explosion.
The Pinnacle plant, which opened last fall, manufactures pellets that are burned for home or industrial heating.