British police were undertaking two more searches Wednesday, following the news that two prisoners had been mistakenly released from prison over the past week, just days after the government had brought in more stringent checks. Police said the two were wrongly freed from Wandsworth Prison in southwest London, which was built in the middle of the 19th century and which has been put into special measures. The latest inadvertent releases come after the asylum-seeker at the heart of a rise of anti-immigrant protests during the summer had been mistakenly let out on Oct. 24 from Chelmsford prison, east of London.