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Gymnasts perform during the 23rd European Trampoline championships in St. Petersburg, on April 11, 2012. AFP PHOTO / OLGA MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images)

The week in pictures 13/4/12

A Titanic tattoo, a hot air balloon crash and an encounter between two polar bears make our weekly photo retrospective.

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