3 members of construction crew killed, 6 injured in crash near Taber, Alta.

Four people were killed and six were injured Friday morning when a pickup truck and a van collided on a highway in southern Alberta near Taber, RCMP say.

A southbound pickup truck and a northbound passenger van crashed at about 7:15 a.m. on Highway 36, south of Highway 875.

A spokesperson with Belectric Canada Solar Inc., which is building a solar plant near the town of Vauxhall, confirmed that the van was transporting a construction crew at the time of the collision.

The lone occupant of the truck was a 31-year-old man from Saskatoon, Sask., police said in a release.

Three people in the van were killed: a 25-year-old man from Edmonton and a 29-year-old man from Medicine Hat, along with the 26-year-old male driver, who was from Camrose.

The names of the deceased will not be released by the RCMP.

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"Belectric offers our deepest condolences to the families, friends and co-workers of all those impacted by today's tragic events," wrote Christine Lewington, a spokesperson for the company, in a statement provided to CBC News. "Belectric will be offering counselling and support to our employees, contractors and service providers.

"We will support our contractors and service providers as they assist the RCMP with their investigation."

Six other passengers of the van were assessed at the scene by EMS and taken to various hospitals.

Of those passengers, two had life-threatening injuries, one was in serious condition and the three others did not sustain serious injury.

Traffic in the area was diverted for several hours from Highway 36 between Highway 875 and Township Road 112.

RCMP said the cause of the collision remains under investigation.

"We do know that road conditions are not believed to be a factor in this fatal collision," said Cpl. Deanna Fontaine with the RCMP. "Everything remains under investigation."