Florence tomb opened in quest to find 'Mona Lisa'

Scientists in the Italian city of Florence have opened a tomb to extract DNA they hope will identify the model for Leonardo da Vinci's Mona Lisa.

The tomb contains the family of Lisa Gherardini, the wife of a silk merchant, who is believed to have sat for the artist.

It is hoped DNA will help to identify her from three skeletons found last year in a nearby convent.

David Willey reports from Rome.