LLOYDMINSTER, Sask. - Six people died in a collision involving a semi and another vehicle, RCMP said Saturday.

Initially police said seven were dead, but they lowered the number to six after investigators were further able to examine the car involved in the crash.

Police were called early Saturday to the scene of what they thought was a semi rollover about six kilometres southeast of the city straddles the Saskatchewan-Alberta border.

When officers arrived, they determined a car had also been involved in the crash, said Cpl. Rob King.

"Once they arrived on scene, they determined that it wasn't a simple rollover of a semi truck as at was first initially reported, but it had been a collision between a semi tanker truck that was hauling crude oil and a four-door small passenger car," he said.

"The semi had flipped over onto its top, onto its roof, into a slough, and the four-door passenger car was completely submerged."

RCMP say the victims were all from the car — three males and three females ranging in age from 13 to 17. Police initially indicated the victms were older but pinpointed the ages late Saturday after speaking to family members.

RCMP say the collision happened at an intersection while the car had been heading east along a rural township road.

Five of the victims were pronounced dead at the scene. One was rushed to hospital but died a short time later.

"Somehow he had been able to free himself from the vehicle when our members got there," King said

Police have not released the names of any of the victims, but King said they were from the "rural area."

The driver of the semi was taken to hospital with undetermined injuries.

King said the investigation could take months to complete.

He said support would be available for the victims' families as well as the emergency responders who were at the scene.

Police closed off roads in the area while they investigated.

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    Naomi Salas-Schafer is shown in a handout photo, released on Sunday July 28, 2013. Salas-Schafer is among the six teenagers who were killed in a car crash Saturday. THE CANADIAN PRESS/HO

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    Tarren Attfield is shown in a handout photo, released on Wednesday June 26, 2013. Attfield is among the six teenagers who were killed in a car crash Saturday.THE CANADIAN PRESS/HO, RCMP

  • Mackenzie Moen

    Mackenzie Moen is shown in a handout photo, released on Sunday July 28, 2013. Moen is among the six teenagers who were killed in a car crash Saturday. THE CANADIAN PRESS/HO

  • Jayden Boettcher

    Jayden Boettcher is shown in a handout photo, released on Tuesday June 18, 2013. Boettcher is among the six teenagers who were killed in a car crash Saturday. THE CANADIAN PRESS/HO, RCMP

  • Aimie Candace Elizabeth Hurley

    Aimie Candace Elizabeth Hurley is shown in a 2010 photo, released on Sunday July 28, 2013. Hurley is among the six teenagers who were killed in a car crash Saturday. THE CANADIAN PRESS/HO, RCMP

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    Kristopher Tavener is shown in a handout photo, released on Sunday July 28, 2013. Tavener is among the six teenagers who were killed in a car crash Saturday.THE CANADIAN PRESS/HO

  • Crews work to pull a semi out of a pond that was involved in a collision with another vehicle near Lloydminster Saskatchewan on Saturday July 27 2013.

  • A trapped up vehicle sits on a trailer after it was involved in a collision with a semi near Lloydminster Saskatchewan on Saturday July 27 2013.

  • Crews work to pull a semi out of a pond that was involved in a collision with another vehicle near Lloydminster Saskatchewan on Saturday July 27 2013. RCMP now say six people died in a collision involving a semi and another vehicle near Lloydminster, Sask.

  • Crews work to pull a semi out of a pond that was involved in a collision with another vehicle near Lloydminster Saskatchewan on Saturday July 27 2013. RCMP now say six people died in a collision involving a semi and another vehicle near Lloydminster, Sask.

  • Tarren Attfiled has been confirmed as one of the victims in the crash. He was from Lashburn, Sask.