From noon to 4 pm today, a caravan of cars is circling around and around the Saudi embassy in the Foggy Bottom neighborhood of Washington, D.C.
And they're all driven by women.
The unusual protest highlights the kingdom's absolute ban on women drivers.
Saudi Arabia is the only country in the world with such a ban, which is enforced not by law but by religious police who also monitor women's clothing, hairstyles, public companions, and other types of behavior.
The demonstration was organized by the Institute for Gulf Affairs, which considers the ban to be gender apartheid.
Saudi Prince speaks out against ban on female drivers
It is meant to promote a protest on Friday, June 17--which would be late Thursday in the United States--in which women plan to drive inside the kingdom in defiance of the law.
As of now, she is still detained. (You can follow the latest news on the detention of Manal Al-Sherif via Twitter, using the hashtag #FreeManal.)
Now, Facebook is being used by a group called "the Iqai Campaign" which suggests that women be whipped if they drive.