Law enforcement officials in the Florida Panhandle said a 16-year-old is accused of killing his 10-year-old sister.

The girl's family told Bay County Sheriff's deputies they last saw her when she went to bed Saturday night. She was reported missing Sunday morning, the News Herald reported.

The sheriff's air unit, mounted posse and K-9s helped search for the girl Sunday. Her body was found in a large field behind the family's home in Fountain, which is northeast of Panama City.

Sheriff's officials have not said what led investigators to the girl's brother, who's charged with an open count of murder. The Associated Press is not naming him because of his age.