BEIJING — More than 100 Chinese Christians seeking to attend an international evangelical conference in South Africa have been barred from leaving the country, some in the group said, because their churches are not sanctioned by the state.

Organizers say that more than 4,000 Christians from around the world will discuss faith, poverty, the AIDS epidemic and other issues at the nine-day conference, which begins Saturday in Cape Town. But members of the Chinese delegation said that they could get no farther than the passport control at international airports in China before officials confiscated their documents.

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