Christian groups in North Korea are vowing to carry on their missionary work despite mounting risks since Korean-American activist Kenneth Bae was imprisoned two years ago. (see news of his release) ‘We are getting more nervous,’ said Kim Seung-eun, a missionary for the Caleb Mission, which is based in South Korea's South Chungcheong Province but frequently travels to North Korea. ‘We have to come up with a strategy to avoid another case like Kenneth Bae's.’ Reticence is necessary, said one US-based activist, because of the dangers involved in propagating religion, especially in an overt, organised way, in a totalitarian state. If one person is caught, then everyone else can suffer the consequences. Open Doors says North Korea has 70,000 Christians held in labour camps.