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Depending on who you ask, the bones that have been sitting in a Tokyo repository for decades could be either leftovers from early 20th century anatomy classes, or the unburied and unidentified victims of one of the country’s most notorious war crimes.

A group of activists, historians and other experts who want the government to investigate links to wartime human germ warfare experiments met over the weekend to mark the 35th anniversary of their discovery and renew a call for an independent panel to examine the evidence.

JAPANESE CRIME BOSS CHARGED BY US PROSECUTORS IN CONSPIRACY TO TRAFFIC NUCLEAR MATERIAL TO IRAN

Japan’s government has long avoided discussing wartime atrocities, including the sexual abuse of Asian women known as “comfort women” and Korean forced laborers at Japanese mines and factories, often on grounds of lack of documentary proof. Japan has apologized for its aggression in Asia, but since the 2010s it has been repeatedly criticized in South Korea and China for backpedalling.

Around a dozen skulls, many with cuts, and parts of other skeletons were unearthed on July 22, 1989, during construction of a Health Ministry research institute at the site of the wartime Army Medical School. The school’s close ties to a germ and biological warfare unit led many to suspect that they could be the remains of a dark history that the Japanese government has never officially acknowledged.

Headquartered in then-Japanese-controlled northeast China, Unit 731 and several related units injected prisoners of war with typhus, cholera and other diseases, according to historians and former unit members. They also say the unit performed unnecessary amputations and organ removals on living people to practice surgery and froze prisoners to death in endurance tests. Japan’s government has acknowledged only that Unit 731 existed.

Top Unit 731 officials were not tried in postwar tribunals as the U.S. sought to get ahold of chemical warfare data, historians say, although lower-ranked officials were tried by Soviet tribunals. Some of the unit’s leaders became medical professors and pharmaceutical executives after the war.

A previous Health Ministry investigation said the bones couldn’t be linked to the unit, and concluded that the remains were most likely from bodies used in medical education or brought back from war zones for analysis, in a 2001 report based on questioning 290 people associated with the school.

It acknowledged that some interviewees drew connections to Unit 731. One said he saw a head in a barrel shipped from Manchuria, northern China, where the unit was based. Two others noted hearing about specimens from the unit being stored in a school building, but had not actually seen them. Others denied the link, saying the specimens could include those from the prewar era.

A 1992 anthropological analysis found that the bones came from at least 62 and possibly more than 100 different bodies, mostly adults from parts of Asia outside Japan. The holes and cuts found on some skulls were made after death, it said, but did not find evidence linking the bones to Unit 731.

But activists say that the government could do more to uncover the truth, including publishing full accounts of its interviews and conducting DNA testing.

Kazuyuki Kawamura, a former Shinjuku district assembly member who has devoted most of his career to resolving the bone mystery, recently obtained 400 pages of research materials from the 2001 report using freedom of information requests, and says it shows that the government “tactfully excluded” key information from witness accounts.

The newly published material doesn’t contain a smoking gun, but it includes vivid descriptions — the man who described seeing a head in a barrel also described helping to handle it and then running off to vomit — and comments from several witnesses who suggested that more forensic investigation might show a link to Unit 731.

“Our goal is to identify the bones and send them back to their families,” said Kawamura. The bones are virtually the only proof of what happened, he says. “We just want to find the truth.”

Health Ministry official Atsushi Akiyama said that witness accounts had already been analyzed and factored into the 2001 report, and the government’s position remains unchanged. A key missing link is documentary evidence, such as a label on a specimen container or official records, he said.

Documents, especially those involving Japan’s wartime atrocities, were carefully destroyed in the war’s closing days and finding new evidence for proof would be difficult.

Akiyama added that a lack of information about the bones would make DNA analysis difficult.

Hideo Shimizu, who was sent to Unit 731 in April 1945 at age 14 as lab technician and joined the meeting online from his home in Nagano, said he remembers seeing heads and body parts in formalin jars stored in a specimen room in the unit’s main building. One that struck him most was a dissected belly with a fetus inside. He was told they were “maruta” — logs — a term used for prisoners chosen for experiments.

Days before Japan’s Aug. 15, 1945 surrender, Shimizu was ordered to collect bones of prisoners’ bodies burned in a pit. He was then given a pistol and a packet of cyanide to kill himself if he was caught on his journey back to Japan.

He was ordered never to tell anyone about his Unit 731 experience, never contact his colleagues, and never seek a government or medical job.

Shimizu said he cannot tell if any specimen he saw at the 731 could be among the Shinjuku bones by looking at their photos, but that what he saw in Harbin should never be repeated. When he sees his great-grandchildren, he said, they remind him of that fetus he saw and the lives lost.

“I want younger people to understand the tragedy of war,” he said.

PARIS (AP) — Rain that fell throughout the opening ceremony continued on Saturday, leading to postponements and delays at the Paris Olympics.

The first event of the skateboarding competition, men’s street skateboarding, was postponed from Saturday until Monday because of the showers. The women’s event is scheduled for Sunday.

Skateboarding is held at the outdoor venue of La Concorde Urban Park in Paris. World Skate, the sport’s governing body, cited adverse weather conditions for the move.

Rain has been one of the big stories early in the Games after constant showers and occasional downpours served as the backdrop for the opening ceremony. As of 10 a.m. CEST (4 a.m. ET), much of the rain had cleared from the area.

The start of play in the scheduled tennis matches on the 10 smaller courts at Roland Garros was delayed because of rain, but action was able to get going in the two main stadiums, which both have retractable roofs. That included the match at Court Philippe Chatrier between No. 1 Iga Swiatek of Poland – who has won four of the past five French Open titles at the same site being used for the Olympics – and Irina-Camelia Begu of Romania.

Sunny skies are expected to return to the area Sunday, but the rain could have a lasting impact on the Paris Games.

The rain could threaten the water quality for swimming in the Seine when the triathlon begins Tuesday. Tony Estanguet, head of the Paris 2024 organizers, addressed the situation at the daily press briefing.

“We are still looking at the forecast for the coming days,” Estanguet said. “They expect that it will rain till 5 p.m. today and then it should be fine.

“The team is very confident that it will be possible to have the (triathlon) swimming part in the Seine.”

The triathlon begins with the men’s event Tuesday, swimming from 8 a.m. CEST (2 a.m. ET) at the Alexander III bridge next to Grand Palais.

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AP Sports Writers Graham Dunbar and Steve Whyno and AP Tennis Writer Howard Fendrich contributed to this story.

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AP Summer Olympics: https://apnews.com/hub/2024-paris-olympic-games