Ukraine and many people all over the world commemorate Thursday the twenty-first anniversary since Chernobyl's explosion, the world's worst nuclear disaster.

The April 26, 1986, explosion at Chernobyl's reactor No 4 spewed radiation across much of northern Europe over a 10-day period.

The accident happened at one of four reactors at the Chernobyl nuclear power plant, 110km north of the capital, Kiev.

It is still unclear how Bulgaria was affected by the fallout as right after the Chernobyl explosion Bulgarian authorities followed Soviet orders and refused to admit anything out of the ordinary had occurred.

Official UN figures predicted up to 9,000 Chernobyl-related cancer deaths. But a Greenpeace report released last week estimated a figure of 93,000. Greenpeace said other illnesses could bring the toll up to 200,000.

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