The rowing men's four team have tweeted a picture of heading in to the Olympic village Post Office to pick up some of the stamps with their faces on.
There are also traditionally sized versions available.
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UK authorities are "urgently looking into" reports that a seven-year-old child with dual nationality is missing following the attack.
Wayne Rooney and his wife Coleen are expecting their fourth child, the couple have announced.
As the silence came to an end the crowd began to applaud and people shouted "I am not afraid!" in defiance of the attacks.