Vazha Margvelashvili and Lasha Shavdatuashvili - who both won judo silver medals - were seen near Tokyo Tower on Tuesday, after their events were finished.

Games CEO Toshiro Muto described it as a "clear and serious violation" of the Games playbooks of health and safety rules to protect against COVID-19, but said the Georgian embassy in Tokyo had apologised for the incident.

The other four were accredited contractors from Britain and the United States arrested for allegedly using cocaine before the Olympics opened.

Muto said there had been eight cases of Games credentials being temporarily suspended.

In four cases, organisers collected a "signed pledge" from people suspected of breaking rules.

Ten strict warnings were issued, Muto said.

Meanwhile, Muto said an investigation had been launched into a group of athletes who were found drinking alcohol in the Olympic village.

The athletes were caught drinking in a village park on Friday night in contravention of Games COVID-19 measures.

"We are looking into the matter. We will take appropriate steps based on our findings," said Muto who added that police had attended the scene.

Muto did not give details of the number of athletes involved or their nationalities.

Athletes are permitted to drink alcohol but only alone in their rooms.

The Games are taking place in Tokyo without spectators and athletes and Olympic visitors have remained in a "bubble" with regular testing for the coronavirus.

Australian Associated Press