London's Metropolitan Police Service said a 31-year-old man had been arrested in London Friday night on terrorism-related offenses, but following standard practice would not give the arrested man's name.

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Well before the G4S debacle hit the headlines, London's Metropolitan Police Service, known as the Met, was planning what it says is its biggest-ever peacetime operation.

CNN: UK faces security questions ahead of London Olympics

London's Metropolitan Police Service, known as the Met, is undertaking what it says is its biggest-ever peacetime operation, running for 66 days across 1, 000 venues, including sporting and cultural events, and making use of up to 9, 500 police officers on the busiest days.

CNN: First 2012 Olympics contests kick off