The damaged nuclear reactors at Japan's Fukushima Daiichi nuclear power plant, which was crippled by a March 11, 2011 tusnami. PALLAVA BAGLA/CORBIS/GETTY

Construction workers stole and sold potentially radioactive scrap metal from near the crippled Fukushima nuclear power plant, the Japanese environment ministry said on Thursday. The materials went missing from a museum being demolished in a special zone around 2.5 miles from the atomic plant in northeast Japan that was knocked out by a tsunami in 2011.

Although people were allowed to return to the area in 2022 after intense decontamination work, radiation levels can still be above normal and the Fukushima plant is surrounded by a no-go zone.

Japan's environment ministry was informed of the theft by workers from a joint venture conducting the demolition work in late July and is "exchanging information with police," ministry official Kei Osada told AFP.

Osada said the metal may have been used in the frame of the building, "which means that it's unlikely that these metals were exposed to high levels of radiation when the nuclear accident occurred."

If radioactivity levels are high, metals from the area must go to an interim storage facility or be properly disposed of. If low, they can be re-used. The stolen scrap metals had not been measured for radiation levels, Osada said.

The Mainichi Shimbun daily, citing unidentified sources, reported on Tuesday that the workers sold the scrap metal to companies outside the zone for about 900,000 yen ($6,000).

It is unclear what volume of metal went missing, where it is now, or if it poses a health risk.

Japan's national broadcaster NHK reported over the summer that police in the prefecture of Ibaraki, which borders Fukushima, had called on scrap metal companies to scrutinize their suppliers more carefully as metals thefts surged there. Ibaraki authorities reported more than 900 incidents in June alone ― the highest number for any of Japan's 47 prefectures.

Officials in Chiba, east of Tokyo, said metal grates along more than 20 miles of roadway had been stolen, terrifying motorists who use the narrow roads with the prospect of veering into open gutters, especially at night.

Maintenance workers with the city of Tsu, in Mie prefecture, west of Tokyo, meanwhile, have started patrolling roadside grates and installing metal clips in an effort to thwart thieves.

But infrastructure crime may not pay as much as it used to. The World Bank and other sources say base metals prices have peaked and will continue to decline through 2024 on falling global demand.

The March 11, 2011, tsunami caused multiple meltdowns at the Fukushima-Daiichi nuclear plant in the world's worst nuclear accident since Chernobyl.

Numerous areas around the plant have been declared safe for residents to return after extensive decontamination work, with just 2.2 percent of the prefecture still covered by no-go orders.

Japan began releasing into the Pacific Ocean last month more than a billion liters of wastewater that had been collected in and around 1,000 steel tanks at the site.

Plant operator TEPCO says the water is safe, a view backed by the United Nations atomic watchdog, but China has accused Japan of treating the ocean like a "sewer."

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