He was arrested at 13. Now Saudi Arabia wants to execute him.

Three years after he was filmed taking part in the bike protest, Saudi authorities arrested Qureiris, then just 13 years old. He was traveling with his family to Bahrain when he was detained by Saudi border authorities on the King Fahd causeway that connects the two countries.

At the time, he was considered by lawyers and activists to be the youngest known political prisoner in Saudi Arabia.

Now, at the age of 18, Qureiris is facing the death penalty after being held for almost four years in pre-trial detention, CNN has learned.