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CALGARY- Following days of exhaustive investigations, Calgary Police have released two photos in hopes they will lead to information about the disappearance of a five-year-old boy and his grandparents.

Timeline: Missing Calgary family Nathan O’Brien, Alvin and Kathryn Liknes

5-year-old Nathan O’Brien, 66-year-old Alvin Cecil Liknes and 53-year-old Kathryn Fay Liknes have not been seen since Sunday night, when Nathan’s mother dropped him off at the Liknes’ Parkhill home for a sleepover. An Amber Alert has since been issued, but so far there is no sign of the trio.

READ MORE: Parents of missing 5-year-old plead for safe return of son, grandparents

On Friday, police released photos of a green truck that was seen in the area the night of the disappearance. Investigators would like to speak with the person who was driving it.

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The truck is described as a late 80s or early 90s, Ford 150, which appears to be kept in very good condition.

Anyone who has information is asked to contact police or Crime Stoppers.

Police also continue to follow up on hundreds of tips, and also spoke with about 75 people who were at an estate sale at the Liknes’ home on Sunday. Anyone who was at the sale who has still not spoken with investigators is asked to call 403-266-1234.

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