Thousands of athletes and officials are to begin arriving in London for the Olympic Games, as questions remain about recruitment of security staff.
Preparations for London 2012 are intensifying with the opening ceremony just 11 days away.
The first priority "Games Lanes" may open on the M4 and the Olympic drug testing lab is beginning work.
Heathrow Airport is standing by to process as many as 120,000 passengers today, about 10,000 more than would be normal for this time of year.
Volunteers will be directing athletes to the coaches and trains that will take many of them to the Olympic Village in Stratford, east London.
The village will house 16,000 athletes and officials at its peak.