London 2012: G4S chief faces MPs over security
The chief executive of security firm G4S will go before MPs to explain why his company was unable to provide the Olympics staff it promised.
Nick Buckles has already apologised after 3,500 extra troops had to be deployed to meet the firm's shortfall.
Culture Secretary Jeremy Hunt said it was no time for a "witch hunt" but "contingency plans" were in place if G4S further failed to deliver.
Chris Mason reports.