William Tyrrell’s foster mother is the sole person of interest in the police investigation of the missing boy.

The NSW Police Commissioner confirmed on Ben Fordham Live investigators are looking at a person of interest in the case of the missing child.

Police sources have told Ben Fordham the person of interest is William’s foster mother, who strongly denies any involvement.

Officers have recently begun extensive searches on three locations in Kendall, where the then three-year-old disappeared.

The car of William Tyrrell’s deceased foster grandmother has recently been seized by police.

Press PLAY below to hear Ben break the news