Labour said today it was seeking an urgent Commons statement by the Government on the shortfall in Olympic security staff.
Keith Vaz, the Labour chairman of the Commons Home Affairs Select Committee, said he has asked G4S chief executive Nick Buckles and its chairman Alf Duch-Pedersen to appear before the Committee next week to explain themselves.
He said: "Considering the assurances we have been given in the past this is very serious and we expect a full explanation from a company that not only have the Olympic contract, but receive hundreds of millions of pounds from the Home Office and other Government departments each year."
Faced with a list of last minute problems, ministers and organisers insist the Olympic security situation is under control.
Theresa May was tonight accused of giving MPs a "selective account" about when she knew G4S were having problems supplying Olympic staff.
MOD confirm picture of UK Olympics troops sleeping on chairs as they cover the G4S shortfall in Olympic security is genuine