India marks 20th anniversary of 1984 Bhopal gas leak disaster

Indian shout slogans during a demonstration to mark the 20th anniversary of 1984 Bhopal gas leak disaster in Bhopal, India, Dec. 3, 2004. The city of Bhopal commemorated when twenty years ago, a toxic gas leak from Union Carbide India Ltd pesticide plant killed more than 3,500, devastated the environment and left this central Indian city with the stigma of being site of the world's deadliest industrial accident.