London police lost a set of keys at an Olympic venue last week — but security was not compromised by the incident.

Officers securing Wembley Stadium, an Olympic soccer venue in west London, reported that a set of internal keys used on searches at the venue were missing, Fox News said.

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

Wembley is one of six stadiums hosting the men's and women's soccer tournaments during the games. The first soccer events began on Wednesday, ahead of the opening ceremony.