Five thousand people were the first to cross the finish line at the Olympic Stadium in the 5-mile National Lottery Olympic Park Run - the first public event at the east London stadium.
Men's winner was Tommy Davies, 26, of Loughborough while former model Nell McAndrew, 38, was the women's winner.
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The 23-year-old was held on suspicion of doing an act likely to cause an explosion to injure or damage property, and endangering safety.
Three men died on the track between Brixton and Denmark Hill in south London.
This year 21 black-tailed godwits have been released into the wild after being reared in captivity as part of a project to boost breeding nu