Thousands of Christians are secretly worshipping in Iran as part of a house church movement in the country.
The Iranian government considers Christianity a threat to Islam. However, Open Doors USA estimates that as many as 450,000 Christians are in Iran. Others estimate there are more than 1 million practicing Christians in the country.
According to the Christian Post, a London-based theological center is training Christian leaders in Iran.
Some 200 Iranian Christians are being trained by the London-based Pars Theological Centre to become Christian leaders of the house church movement.
"Pars sees this as a real chance to train agents of change who would transform the Iranian society from the bottom up by fostering a grassroots development of the values of Jesus in an Iranian style," a source with the center said.
"It is not anti-Iranian," the source said. "It's an Iranian movement. It's a great, great number of Muslims turning to Christ."
About four or five Christians are part of each house church. They change the place of meeting each time.
"If they want to sing, they have to sing very quietly or not sing at all," the source said.