CALGARY - Calgary police are searching for a missing child and his grandparents.

Police say five-year-old Nathan O'Brien had been staying with his grandmother and grandfather.

But no one was home when his mother arrived to pick him up.

Officers say evidence at the house suggests the disappearance of all three family members may be suspicious.

The grandparents have been identified as Alvin Cecil Liknes, 66, and Kathryn Faye Liknes, 53.

Anyone with information is asked to call Crime Stoppers.