An 18-year-old boy who was arrested at age 13 for taking part in an anti-government protest in Saudi Arabia now reportedly faces the death penalty after being held for years in pre-trial detention.

Amnesty International says Saudi Arabia is making use of the death penalty to crush opposition figures, as a crackdown led by Crown Prince Mohammed bin Salman against Muslim preachers, members of the press and intellectuals widens in the conservative oil-rich kingdom.