Children of the victims of 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, celebrate during a protest after getting their memorandum signed by the prime minister's office (PMO) in New Delhi June 27, 2011. Dozens of children on Monday protested outside PMO demanding medical care, rehabilitation and poison free environment in Bhopal, a media release said. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENVIRONMENT)