UPDATE: Teen girl and man found dead in crashed car in Callahan retention pond, Florida Highway Patrol says.

According to Florida Highway Patrol, a teen girl and man were found dead in a car in a retention pond in Callahan on Friday morning.

Nassau County Sheriff's Office, which was initially investigating the incident, called FHP at 9:15 a.m.

According to a media briefing by FHP, "a two-door silver Ford Mustang was traveling down Wind Chime Lane, just off of U.S. 1, when it went through a fence and into a retention pond," FHP Sgt. Dylan Bryan said.

"The two people found dead inside the car are a 23-year-old man, who was the driver, and a 17-year-old girl, who was the passenger," Bryan said.

The Nassau County School District confirmed that the 17-year-old girl was a student at West Nassau High School.

FHP believes the crash happened between 12 a.m. and 2 a.m., as a family reported the 17-year-old girl missing around that time.

Both people in the car were not wearing seat belts, according to Bryan.

The crash itself is still under investigation by FHP.