Saudi Arabia has introduced a series of new laws which define atheists as terrorists, according to a report from Human Rights Watch.
In a string of royal decrees and an overarching new piece of legislation to deal with terrorism generally, the Saudi King Abdullah has clamped down on all forms of political dissent and protests that could "harm public order".
The new laws have largely been brought in to combat the growing number of Saudis travelling to take part in the civil war in Syria, who have previously returned with newfound training and ideas about overthrowing the monarchy.
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To that end, King Abdullah issued Royal Decree 44, which criminalises "participating in hostilities outside the kingdom" with prison sentences of between three and 20 years, Human Rights Watch said.