After blocks of prime seats were left empty at Olympics venues, organizing chief Sebastian Coe said yesterday that troops and local students were being given tickets to fill the gaps.

Coe answered widespread criticism after the first full day of competition by predicting that seats left unused, largely by Olympics and sports officials, would stop being an issue as the Games move through the preliminary rounds.

"It is obvious, some of those seats are not being used in the early rounds so that's where we put the military in there. That's why we have students and teachers in there," Coe told reporters

He declined to blame Olympic sponsors, whom he had earlier promised to "name and shame" if they did not use their allocations.

The issue is sensitive for Olympics organizers and British sports fans after hundreds of thousands of people failed to get tickets in a public ballot.

"There is not a single person who thinks it is shambolic," Coe said, adding that no one would object to free tickets for military personnel who "stepped up to the mark" this month to help solve a security staffing crisis at venues.

Coe's organizing team has long promised to fill venues and avoid having empty seats.

Yet broadcast images of signature Olympic events such as gymnastics and swimming revealed rows of empty seats for qualifying rounds on Saturday. Tennis matches at Wimbledon's Centre Court were sparsely attended just weeks after the iconic Grand Slam event there was completely sold out.

Army personnel were attending gymnastics sessions yesterday morning at the North Greenwich Arena during down time from security duties.

"There are a whole bunch of the military actually sitting in those seats at the moment. We can and we have moved them in there," Coe said.

Students and teachers from east London neighborhoods would also get late calls for free tickets having already been accredited in a planned reallocation program.

Some ticket holders would get upgrades inside venues, Coe added.

Some blame for the opening day embarrassment was falling on "accredited people" - including the Olympic family, athletes, and some sponsors and media, organizers said.

Coe said it was typical at the Olympics for sports and national team officials to be "dragged to any number of venues," and be too busy to attend events in the opening days.

"I don't think you will be seeing this as an issue long-term during the games."

Coe also defended sponsors, whose legal rights to protect their brand at the Olympics often fuel criticism.

"I am not sure naming and shaming is what we are into at the moment. Sponsors are turning up," Coe said.

Coca-Cola and Visa said they gave most of their allocated seats to prize winners in promotional offers.

Coca-Cola said its competitions allowed people "to choose the event they really wanted to attend."

Visa said it made "great efforts to ensure that our ticket allocations are fully used."