The Sinn Fein president has undergone a third day of questioning by detectives about the 1972 murder of Belfast mother-of-10 Jean McConville. Mr McGuinness, addressing a rally in the staunchly republican Falls Road, singled out what he has dubbed the "dark side" of policing for criticism.
Video: Martin McGuinness blames anti-Sinn Fein police for Gerry Adams arrest
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