More than 200 tonnes of uranium remain inside the reactor that exploded three decades ago at the Chernobyl nuclear power plant, raising fears there could be more radioactive leaks if the ageing concrete structure covering the stricken reactor collapses.
International donors are meeting on April 25 to discuss a funding plan for the installation of a more modern and safe sarcophagus that could last a century and keep generations from living in fear.
At 1:23 am on April 26, 1986, reactor number four of the Chernobyl nuclear power plant, located about 100 kilometres north of Kiev, exploded during a safety test.
For 10 terrifying days, the nuclear fuel kept burning, spewing clouds of poisonous radiation that contaminated up to three-quarters of Europe, with Ukraine and neighbouring Belarus and Russia hit especially hard.
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As the horror unfolded, the Soviet authorities said nothing publicly, in keeping with a tradition of preventing people from learning of tragedies that could tarnish the image of the Cold War-era superpower.
The first alarm was raised on April 28 by Sweden, which detected an unexplained rise in its own radiation levels.
Only in his second year on the job, Communist Party Secretary General Mikhail Gorbachev - winner of the 1990 Nobel Peace Prize for championing democratic and economic reforms - did not publicly admit the disaster until May 14.
With the scale of what had happened now out in the open, the authorities in 1986 relocated 116,000 people from the 30-kilometre exclusion zone that surrounds the now-dormant plant.