'Green Book' wins original screenplay Oscar

"Green Book" has won the Oscar for original screenplay.

The winners are Nick Vallelonga, Brian Currie and Peter Farrelly.

"Green Book" is based on the real-life story of Vallelonga's father, who drove African-American pianist Don Shirley on a tour through the Deep South in the 1960s and is played by Viggo Mortensen in the film.

"Green Book" is also nominated for best picture, and has already won the best supporting actor Oscar for Mahershala Ali, who played Shirley in the film.