Man held over 'expenses leaks'
The arrest is believed to relate to media stories detailing expenses claims of people employed to protect the likes of ex- prime minister Tony Blair.
Officers from the MPS Directorate of Professional Standards arrested the 27-year-old man on suspicion of breaching Section 5 of the Official Secrets Act.
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Hide AdPolice said the man was a former contractor to the MPS. He was arrested at work in central London and was in custody.
This month, a newspaper revealed claims made by the team of officers who protect Mr Blair around the clock.