LONDON (AP) — Prime Minister David Cameron says he shares Britons' frustrations at seeing empty seats in London Olympic venues and promises "we can do better."

Cameron tells broadcaster ITV that Olympic organizers need to "make sure more people get to see more games and also that there are fewer empty seats."

He says the London organizing committee is "on track to do that."

Organizers, who have long promised packed venues, have been criticized after blocks of empty seats were seen at most events on the opening weekend.

They said seats were left unused by sports and Olympic officials, athletes, some media and "a handful of sponsors."

London organizing committee spokeswoman Jackie Brock-Doyle says 3,000 extra tickets were made available and sold for Monday's events.