The victims of Friday’s explosion at the Nexen Long Lake plant are two men, aged 52 and 30, according to Alberta Occupational Health and Safety.

The workers were inside a building on the Nexen site near Fort McMurray when an explosion killed the 52-year-old and seriously injured the 30-year-old.

The injured man suffered serious burns in the blast and was brought to a burn unit in Edmonton in critical condition.

“Every worker should be able to go home safe at the end of their shift and this is so tragic,” said Pam Sharpe, OHS spokesperson. “Our thoughts are with these workers’ families and friends at this time.”

The men were in the unit known as a hydrocracker.

On Saturday, Ron Bailey, the senior vice-president of Canadian operations, said the victims were maintenance workers.

OHS said the workers were changing valves on a compressor at the time of the explosion.

With files from CTV's Amanda Anderson