Officers from nine police forces have been drafted in as cover to fill the gaps left at the upcoming Olympic Games by security firm G4S.
The officers will patrol venues at the Games alongside the extra 3,500 troops that are to monitor the multiple venues.
Assistant Commissioner Chris Allison, the National Olympic Security Co-ordinator, said: "Nine venue forces have now deployed police officers to support security regimes at venues in their areas."
The forces involved include Dorset, Surrey, Hertfordshire, Northumbria, South Wales, Strathclyde, West Midlands, Thames Valley Police and Greater Manchester Police.
The opening ceremony of the Games takes place on July 27.