Authorities are searching for a 16-year-old girl who was last seen at her South Carolina home more than 10 days ago. The Aiken County Sheriff's Office is asking the public for help in finding Briana Yow, who went missing "shortly before midnight" on April 5, according to a news release issued by the agency on Monday, April 13. That night, Yow left her home in Aiken and was seen entering a car with "an unknown person," the sheriff's office said. She is considered a runaway, according to authorities.