A protest is due to take place later in Saudi Arabia against the ban on women drivers.

Activists and organisers have urged both women and men to call for a lifting of the informal ban.

It's the third such campaign; the first was more than 20 years ago. Then many of those who took part lost their jobs or were detained.

On Thursday, the Saudi interior ministry issued a warning for women not to join this latest protest.

Sebastian Usher reports.