Seven former senior employees of Union Carbide’s Indian subsidiary were convicted today of “death by negligence” for their roles in the Bhopal gas tragedy which killed an estimated 15,000 people more than a quarter of a century ago.

Thousands of civil rights activists, survivors and other protesters gathered in Bhopal today to mark the 20th anniversary of the world’s worst industrial accident and demand justice for hundreds of thousands of people still suffering in the aftermath.