The 28 Christians were said to be worshipping at the home of an Indian national in the eastern city of Khafji, when the police entered the building and took them into custody. They have not been seen or heard from since, raising concerns among human rights groups as to their whereabouts. Nina Shea, director of the Washington-based Hudson Institute’s Center for Religious Freedom, told FoxNews.com: ‘Saudi Arabia is continuing the religious cleansing that has always been its official policy. ‘It is the only nation state in the world with the official policy of banning all churches. ‘This is enforced even though there are over two million Christian foreign workers in that country. Those victimized are typically poor, from Asian and African countries with weak governments.’ Activists are now calling on the U.S. to use its considerable influence in the region to help secure the release of the incarcerated Christians. A spokesperson for the Saudi government claimed to have no knowledge of the arrests, according to Fox News. But the English-language newspaper, The Saudi Gazette, as well as several Saudi Arabic-language news outlets, have reported on the arrests.