* Samoa in lockdown due to COVID-19
* Pullout comes just over three weeks before start of Games
* Setback for Japan's efforts to successfully stage event
* Japan weighs extending virus curbs in capital region
MELBOURNE, July 1 (Reuters) - Japan's prime minister said on Thursday it was possible the Olympics would be held without spectators as Samoa withdrew its weightlifting team from the Games, in the latest setback for Tokyo's fraught efforts to stage the world's biggest sporting event during a pandemic.
Eleven Samoan athletes have qualified for the Games, but of them only three, its weightlifters, are based in Samoa and have been barred from attending the event set to start later this month, the Pacific island nation's Olympic committee president Patrick Fepuleai told Reuters.
"We are still under a state of emergency, we're in lockdown," he told Reuters by phone. The Samoans will have a presence at the Games as the other athletes who are already overseas are clear to go, he added.
Disappointed by the news, Samoa's weightlifting boss, Tuaopepe Jerry Wallwork, told Reuters: "It's terrible, it's disheartening, it's very disheartening."
"There will be a huge impact on the athletes, we put in many years preparing for the event," he added.
The Summer Games are scheduled to start on July 23, after a year's delay due to the pandemic. But polls show a majority of Japanese still oppose holding the event this year amid warnings from health experts that it could unleash another wave of infections and spawn new, more potent variants.
Holding the Games without spectators would be one way of reducing the risk of infections, medical professionals and others have said.
"I have clearly stated that having no spectators is a possibility," Prime Minister Yoshihide Suga told reporters on Thursday.
The government will make a decision on spectators and on whether to lift a 'quasi' state of emergency next week, Suga said.
His comments came after the leader of the junior party in Suga's ruling coalition said organisers should consider holding the Games without spectators.
"I hope they make a timely decision, and consider the possibility of not allowing spectators," said Natsuo Yamaguchi, who is head of Komeito, the junior partner in the ruling coalition with the Liberal Democratic Party, according to national broadcaster NHK.
On Thursday, daily coronavirus infections totalled 673, down slightly from 714 the previous day, which was the highest in more than a month.
Japan is likely to extend coronavirus prevention measures https://www.reuters.com/article/us-olympics-2020-japan-coronavirus/japan-likely-to-extend-covid-19-curbs-in-tokyo-as-infections-rise-sources-idUSKCN2E73HF?feedType=RSS&feedName=healthNews in the greater Tokyo region by two weeks or more, government sources told Reuters on Thursday.
Depending on the extent of the strain on the medical system, the government may reinstate a state of full emergency for Tokyo, the sources added.
Tokyo and three neighbouring prefectures are among areas under the 'quasi' state of emergency until July 11, and retaining the curbs could affect the number of spectators allowed into Olympic venues, the sources said.
A study on Wednesday said that even under the "most optimistic scenario", new cases in Tokyo could reach 1,000 a day in July and 2,000 in August. Should infections accelerate during or after the Games, hospital bed usage in the capital could reach its limit in August, according to the study carried out by university researchers and the National Institute of Infectious Diseases project.
FUKUSHIMA CANCELS PLANS
The COVID-19 situation has also prompted officials in the prefecture of Fukushima to cancel events planned to showcase its recovery from devastation by the 2011 earthquake and tsunami, which led to the worst nuclear disaster since Chernobyl.
The prefecture, forever synonymous with nuclear calamity, is to host baseball and softball events at a stadium about 70 km (41 miles) from the Fukushima Daiichi nuclear station owned by Tokyo Electric Power on the Pacific coast.
Events to promote the prefecture's food and other products, while giving spectators information on efforts to revive evacuated towns as areas get cleared of radiation fallout, will all be cancelled because of virus curbs, its governor said.
"We have to cancel, given the current situation," Governor Masao Uchibori, told a news conference in a video on the prefecture's website. "I'm not going to lie - I resent this novel coronavirus."
(Reporting by Jonathan Barrett in Sydney, Ian Ransom in Melbourne, Sakura Murakami, Eimi Yamamitsu, Rocky Swift and Aaron Sheldrick in Tokyo; Editing by Himani Sarkar and Ana Nicolaci da Costa)