This week marks the 20th anniversary of the world's deadliest industrial accident.
Thousands of people in the town of Bhopal, India were killed when several tons of deadly gas leaked from a pesticide plant that was owned and operated by U.S.-based Union Carbide. Human rights groups say thousands more have died in the years since the accident.
Activists say Union Carbide neglected safeguards at the plant, but the company says the leak was due to sabotage.
Amnesty International says Bhopal remains an environmental disaster because Dow Chemical -- which now owns Union Carbide -- has refused to clean up the plant. Amnesty also says the company has not properly compensated the victims.