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Associated Press
During a training exercise for London's emergency services, people run towards armed police officers as they emerge from the disused Aldwych underground train station in London, Tuesday, June 30, 2015. Hundreds of British police are taking part in a major counter-terror exercise in London, testing the abilities of emergency services to respond to a Tunisia-style attack of extremists with firearms. The exercise dubbed Operation Strong Tower has been planned for six months and is not connected to the recent attack at a north African beach resort.  (AP Photo/Matt Dunham)

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