Peace activists hold placards as they urge U.S. President Barack Obama for extradition of former chairman of Union Carbide Corporation Warren Anderson, during a campaign for the victims of Bhopal gas disaster in the central Indian city of Bhopal June 11, 2010. An Indian court on Monday sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. REUTERS/Raj Patidar (INDIA - Tags: CIVIL UNREST DISASTER SOCIETY)