London - Those empty seats you might be seeing in Olympic arenas? Officials aren't thrilled, and they want to know why.

Organisers are investigating why rows of seats at some venues, including the Aquatics Centre, were empty on Saturday, the first full day of competition at the London Games.

"Very disappointing," says Britain's culture secretary, Jeremy Hunt. He says venues and stadiums should be full to improve the atmosphere for athletes and spectators.

London organisers "are doing a full investigation into what happened," Hunt says. He says he believes the empty seats belonged to sponsors. The London Games organising 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."