LONDON (Reuters) - British security firm G4S
In July the British government placed all contracts held by G4S and its rival Serco
The government had then asked the SFO to consider carrying out an investigation into G4S and has since also referred Serco to them.
G4S said on Monday it would co-operate fully with the SFO investigation. Shares in the firm were down 1.2 percent to 251.2 pence at 1108 GMT.
(Reporting by Neil Maidment; Editing by Rhys Jones)