"My biggest worry is the weather, " Paul Deighton, chief executive of the committee running the London Olympics, said at a news conference on Tuesday.

WSJ: As Games Open, Britons Excel at National Sport: Talking About Rain

The committee also criticised the ticketing system used for the London Olympics, which saw the public unable to buy a large proportion of tickets for major events.

BBC: MPs warn on London 2012 volunteering legacy

G4S, the firm that failed to provide enough security guards for the London 2012 Olympics, has struck a compensation deal with the Games' organising committee, Locog.

BBC: G4S Olympic losses increase to ?70m

When London wanted to host the 2012 Olympics, it had to convince the International Olympic Committee (IOC).

BBC: Selling the Olympics to the Swiss

The decision by the London 2012 Organising Committee means that all venues are now in place for the Olympics.

BBC: Coventry City's Ricoh Arena chosen for Olympics