Hundreds of firefighters and fire engines, as well as helicopters and airplanes, are battling forest fires near the site of the 1986 Chernobyl nuclear disaster.
Radiation levels in the Chernobyl Exclusion Zone is usually low, but the fires have caused a dramatic increase in radiation.
Over the past 34 years, radiation has been absorbed into the soil and the vegetation, but when a fire breaks out, the radiation is released to the surface by the particles in smoke.