Security teams have carried out an anti-terrorism exercise at the Olympic Village in east London.
The three-day drill involved the Metropolitan Police, other emergency services and the Ministry of Defence.
The Met said the operation, held in recent days, was to ensure security arrangements were adequate.
During the 2012 Games the accommodation complex, which is adjacent to the Olympic Park, will host hundreds of athletes and officials.
The Met spokesman said the operation was staged as part of a "robust testing and exercising programme".
"It was one of a series of counter-terrorism exercises involving the MoD, MPS and other emergency services," he said.
"It was not held in response to any specific threat, but it is the latest live play exercise to be held within an Olympic venue as part of our preparations for the Games."