Jamaican sprinter Usain Bolt was presented to the crowd in the top of a giant rocket during on the first day of the IAAF London Diamond League meeting - dubbed the 'Anniversary Games' - at the Olympic Stadium in London.
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The ex-combatants were sworn in on Friday.
The schoolgirl was found dead on the Isle of Bute on July 2.
The young prince and his family are rumoured to be holidaying in the Caribbean.