The New York State Police added a suspect is in custody over her disappearance.

She disappeared while riding her bike on Saturday evening in Moreau Lake State Park, about 35 miles (60km) north of Albany.

More than 100 personnel and 75 law enforcement officials were deployed in the search for the girl, which also included dogs, two drones, boats and six underwater rescue teams, according to New York Governor Kathy Hochul.

Ms Hochul previously said Charlotte and her family were camping only 15 minutes from where she and her sisters were raised, and the nine-year-old had been riding Loop A of the park with family friends when she said she wanted to do one more lap by herself.

When she didn't return 15 minutes later, her parents and nearby campers began to search the area.