FILE – In this Dec. 4, 1984 file photo, Indians mourn a victim of poisonous gas leak from the Union Carbide plant in the central Indian city of Bhopal. Indians are marking the 30th anniversary of the Bhopal gas leak tragedy with protests demanding harsher punishments for those responsible and more compensation for the victims of the world's worst industrial disaster. On Dec. 3, 1984, the pesticide plant leaked about 40 tons of deadly methyl isocyanate gas into the air, killing an estimated 15,000 people and affecting at least 500,000 more. Michigan-based Dow Chemical Co. took over Union Carbide in 2001. (AP Photo/Sondeep Shankar, File)