Ukraine is preparing to mark 30 years since the Chernobyl disaster, the world's worst nuclear accident whose death toll remains a mystery and which continues to jeopardise the local population's health.
Agence France-Presse: Ukraine to mark 30 years since Chernobyl shook the world
A police officer checks the level of radioactivity on vehicles leaving the 30-kilometer exclusion zone around Chornobyl on May 10, 1986.
