At least 115 Christians were arrested last year for practicing their faith in Iran, according to a report by Article 18, a London-based nonprofit that promotes freedom of religion in the country.

There are approximately 800,000 Christians in Iran, of which 130,000 are ethnic Armenian and Assyrian Christians, and the remaining 670,000 converts from Islam. The Iranian government considers Christians who have converted from Islam to be apostates, a form of religious abandonment which is a criminal offense under Iran’s law.