Calgary police have questioned two men in relation to last week's hit-and-run in Beddington Heights that seriously injured two children, but determined they were not involved in the incident.

Staff Sgt. Paul Stacey told CBC Calgary in the morning that two persons of interest were being interviewed. Later in the day, he said investigators had cleared the men of any involvement.

Stacey said police still have no suspects and the case remains an "active investigation" with investigators continuing to follow up on tips.

The Nov. 20 collision sent an 11-year-old boy and his nine-year-old sister to hospital with serious injuries, including broken bones.

A witness said a white pickup truck "mowed over" the children and didn't appear to even slow down at a stop sign before striking them and driving off.

Their mother, Amber Chinery, has been pleading with the driver to come forward.

Daughter in cast for months

She said her daughter suffered a broken femur in the collision and will have to wear a cast that runs from her armpits to the ankle of the broken leg for the next two or three months.

Her son suffered a broken shoulder, lung damage, and spinal injuries, and had to undergo surgery for his internal injuries.

Paramedics responded to the scene of the collision near the intersection of Berkley Drive and Bermondsey Way N.W. (Monty Kruger/CBC)

Chinery said her other son, a twin to the nine-year-old girl, was also walking with his siblings but was able to leap out of the way when the truck plowed through the intersection.

"He does have some guilt with feeling he should have been able to push his brother and sister out of the way," Chinery said.

"But we are trying to keep things really positive and let him know that he is a hero because he did the right thing and ran home and got me, and I was able to be there with my children."

The kids are out of the hospital now but Chinery said her son is still having nightmares about the incident.

CBC is not naming the children at the request of the mother, who did supply photographs of them for this story.