SAY NO TO NUCLEAR POWER
Bells tolled 20 times starting at 1:23am, marking the exact time of the explosion at Reactor No.4 on April 26, 1986.
The blast killed 56 people but thousands more are thought to have died as radioactive fallout spread across Russia and Europe following the accident.
Experts believe there was 10 times more radiation released than when the atom bomb was dropped over Hiroshima in 1945.
Poisonous gasses contaminated thousands of acres of farmland across Europe including Britain, with some farms still affected two decades on.
In North Wales alone, 359 farms are still operating under radiation restrictions which limit the movement of livestock and require the regular testing of animals, soil and water.