A child's gas mask and a shoe are seen at a kindergarten in the abandoned city of Prypiat near the Chernobyl nuclear power plant, April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26. Engineers are still struggling to regain control of damaged reactors at the Fuskushima plant after last month?s earthquake and tsunami, in the worst nuclear crisis since Chernobyl in 1986, with the government urging the operator of the plant to act faster to stop radiation spreading.  REUTERS/Gleb Garanich (UKRAINE - Tags: ANNIVERSARY DISASTER ENERGY ENVIRONMENT)