LONDON -

Olympic organizers are investigating why rows of seats at some venues were empty on the first full day of competition at the London Games.

Britain's Culture Secretary Jeremy Hunt says Saturday's empty seats at venues including the Acquatics Centre were "very disappointing" and stadiums should be full to improve the atmosphere for athletes and spectators.

He says London organizers "are doing a full investigation into what happened." Hunt says he believes the empty seats belonged to sponsors.

The London Games organizing committee said in a statement emailed to The Associated Press it is looking into "who should have been sitting in the seats, and why they did not attend."