Sept. 30 (Bloomberg) -- U.K. police arrested three men in connection with the killing of Barclays Wealth Chief Operating Officer Frank McGarahan, who was assaulted after a night out. The three men are all in their early 20s and local to Norwich, Norfolk, where McGarahan was injured at about 3 a.m. on Sept. 28, Norfolk Constabulary spokesman Jonathan Dack said in a telephone interview. McGarahan, 45, died yesterday in Addenbrookes Hospital, Cambridge. The men are being held at different police stations across Norfolk and will be interviewed today and tomorrow, Dack said. A postmortem examination was scheduled for today to establish the exact cause of death for McGarahan, who was kicked and punched by a gang of young men, Detective Superintendent Chris Hobley said in an interview with the British Broadcasting Corp. ``We are making significant progress with the investigation,'' Hobley said earlier today, adding that security camera footage and information from members of the public have given detectives ``very positive lines of inquiry to pursue.'' McGarahan, from Hertfordshire, had been spending an evening out with relatives and friends before a family christening in Norwich, police said. He witnessed a fight while waiting for a taxi on Guildhall Hill, and later suffered a fatal injury. Witnesses said he went to help a young couple who were being attacked by a gang of men in their early 20s, and suffered head injuries when the gang turned on him, the Daily Mail reported, citing an unidentified member of his family. http://www.bloomberg.com/apps/news?pid=20601102&sid=aRQ16EKgern4&refer=uk