A desperate search is underway in Nova Scotia, Canada, for 6-year-old Lily Sullivan and her 4-year-old brother Jack, who have been missing for four days.
The children were last seen Friday morning at their home in rural Pictou County, about 70 miles from Halifax.
Authorities believe the siblings may have wandered off into the dense woods surrounding their home.
Dozens of rescuers and volunteers are combing the area as the search intensifies.