Sheikh Ahmed al-Ghamdi, a Saudi cleric in the holy city of Mecca, recently declared that nothing in Islam bars men and women mingling in public places like schools and offices. For the first time in decades, religious scholars are debating the previously untouchable hallmark of gender segregation.
The professor had been arrested after publishing a critical report.
The two-day protest, publicized on Facebook, drew 60 fasters and 800 online comments.
Forty Saudis plan a hunger strike this week to bring attention to the prolonged detention of 11 political activists.
Some say it's a sanctuary for business women. Others see it as another sign of gender segregation in a male-dominated society.