Protesters demanding the release of 23 imprisoned activists and workers clashed with security guards at a demonstration in central Phnom Penh on Sunday, with the crowd then beating at least three plain-clothes men they suspected of having been planted among them to stir up trouble. Two of the men—one with a bloody wound to the head—were afterward driven off by some of the protesters and handed over to police in Chamkar Mon district’s Boeng Keng Kang I commune, who sent them on to municipal police headquarters.