AUSTIN, Man. - The desperate search for a missing toddler in rural Manitoba toddler has resumed.

The RCMP say their massive search for two-year-old Chase Martens, who vanished on Tuesday, includes unmanned drones that will help photograph and map the area.

The boy's distraught parents have pleaded for any information that might lead to a reunion with their son, saying it would be unusual for Chase to wander off the property without the family dog.

Police have not ruled out foul play, but have said it is not the focus of their investigation.

The search involving hundreds of people on foot and horseback, driving ATVs and in the air expanded Thursday to include creeks and shorelines within a three-kilometre radius of the family's home.

Police say underwater dive teams have also been brought in to help with the search.