The Home Secretary, Theresa May, appeared in the House of Commons earlier to answer urgent questions on security arrangements for the London Olympics.
It's been revealed that an extra 3,500 military personnel will have to be deployed because of a short-fall in the number provided by the private security firm G4S.
A committee of MPs has said the problems with recruiting security staff for the Olympics should have been foreseen.
The boss of the government's Olympics' security contractor G4S has faced a dressing down from MPs for his firm's poor performance.
The head of G4S is under pressure to quit his £830,000-a-year job as he prepares to face questions from MPs