Vu Minh Khanh (C) holds image of her husband Nguyen Van Dai as Catholics hold candles and images of Dai's assistant Le Thu Ha during a mass prayer for Dai and Ha at Thai Ha church in Hanoi, December 27, 2015. Rights activist Nguyen Van Dai, who was badly beaten this month by unknown attackers, was arrested last week for anti-state “propaganda”, the latest incident in what rights groups are calling an alarming crackdown on government critics. (Photo by Reuters/Kham)
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