London police lost a set of keys last week to Wembley Stadium, an Olympic soccer venue in west London, Scotland Yard said. But officials say security wasn't compromised.

Although the keys haven't been found, there was no evidence of criminal offenses, the force said. They believe police probably misplaced the keys.

Organizers of the London Olympics stressed that relevant locks have been changed and there was no security breach. Police declined to provide more details about what the keys were for.

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