Heathrow Airport welcomes London 2012 athletes
16 July 2012 Last updated at 07:45 BST
Thousands of athletes and officials are arriving in London for the Olympic Games, as questions remain about the recruitment of security staff.
Preparations for London 2012 have been intensifying with the opening ceremony just 11 days away.
The BBC's Luisa Baldini reports from Heathrow Airport in London.