Occupational Health and Safety (OHS) are investigating after two men died in separate workplace incidents Friday.

A spokesperson with OHS told CTV News the first incident occurred around 4 p.m. at an oil rig site near Highvale.

“The service rig was pulling a rod out of the hole when the block fell down and struck the worker,” Jennifer Dajsvik explained.

She said a 24-year-old worker was killed as a result of the impact.

“They are heavy blocks and fell from quite a distance.”

A stop-work order has been issued for the site, which is owned by New Star Energy.

A spokesperson from the company told CTV News the site was secure and the company was co-operating with OHS officials.

They also said their thoughts and prayers went out to the family of the worker.

No further details about the deceased worker have been released.

Highvale is about one hour southwest of Edmonton.

Dajsvik said the second incident happened in Fort McMurray just before 6 p.m.

A semi-truck on the Steinhauer Bridge involved in the construction currently underway on the bridge was dumping, she explained.

“While it was dumping it slipped, tipped over falling onto the cab of the next semi-trailer.”

The 48-year-old man in the cab was crushed.

A stop-work order has been issued for the site and the investigation is ongoing.

With files from Amanda Anderson