Missing 5-year-old last seen in store parking lot, caretaker says

NEW YORK (CNN) -- The foster father of a missing California boy with cerebral palsy says he left the child alone near his car before the child vanished five days ago from a shoe store parking lot.

Hasanni Campbell was last seen wearing shorts and white braces on his ankles because of his cerebral palsy.

Louis Ross told HLN's Nancy Grace that he left 5-year-old Hassani Campbell outside his BMW for two to five minutes Monday afternoon. Ross said he went to the front door of the store to ask his fiancee, Jennifer Campbell, who works there, to open the back door.

"By the time I got there, Jennifer is already out of the store, walking toward me, asking, 'Where is Hasanni?' And I say, 'What do you mean, where is Hasanni?' And I look around to the side, and he is no longer there."

Police in Oakland, California, and the FBI are searching for Hasanni and investigating his disappearance.