Usain Bolt has won his first race in Europe in 2012. He ran a time of 10.04 seconds over 100 metres.
The Jamaican runner beat British sprinter Dwain Chambers and an international line-up at the Golden Spike event in Ostrava, Czech Republic.
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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