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BOULDER COUNTY, Colo. — A cyclist was critically injured in a crash believed to be from collision with a deer this weekend.

On Saturday at about 8:33 a.m., responders received a call from an off-duty firefighter who found the injured woman; the cyclist appeared to have been riding by herself.

The victim, a 60-year-old Boulder woman, was unconscious when she was found.

She was taken to a hospital via ambulance for treatment of life-threatening injuries.

Due to the severity of her injuries, the victim’s identity has not been released.

A preliminary investigation lead deputies to believe that the crash was caused by the victim colliding with a deer, the Boulder County Sheriff’s Office concluded.

It does not appear that any cars were involved in the crash and there are no suspicious circumstances.

Authorities didn’t release the condition of the deer involved in the collision.