LVIV, Ukraine - Ukrainian state nuclear company Energoatom warned on Monday that radiation levels around the occupied Chernobyl nuclear plant risked rising because its radiation monitoring system and forest fire-fighting service were not working.
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Soon after launching an invasion on Feb. 24, Russian forces took control of the territory around the now-defunct power plant that was the site of the world's worst nuclear accident in 1986.
As a result, the system monitoring radiation levels in the 30-km (19-mile) so-called exclusion zone in the forests around the plant is currently not working, Energoatom said in a statement.
"There is no data on the current state of radiation pollution of the exclusion zone's environment, which makes it impossible to adequately respond to threats," it said.
It said seasonal forest fires, which occur most often in spring and summer, posed a particular threat as the zone's forest fire service was unable to work.
"Radiation levels in the exclusion zone and beyond, including not only Ukraine, but also other countries, could significantly worsen," it said.
Despite the presence of Russian forces, Ukrainian staff have continued to work at Chernobyl's radioactive waste facilities, remaining on shift despite fears of burn-out because it was not possible to swap in a new shift of workers.
On Sunday, the U.N. nuclear watchdog said some new staff and rotated in, allowing half of the previous shift to leave.