Hundreds of survivors of the Bhopal industrial disaster in India have burned effigies of a London Olympics official and an Indian official to protest against Dow Chemicals' sponsorship of the 2012 Games.
The protests came on the eve of the anniversary of the world's worst industrial disaster on 2 December 1984. A Union Carbide pesticide plant in the Indian city leaked lethal gas that killed an estimated 15,000 people and maimed tens of thousands more.
Dow bought Union Carbide in 2001 and insists that the legal claims surrounding the incident were not their responsibility.
Dow is sponsoring a curtain-style wrap around the main Olympic Stadium in east London.
London Olympic organisers have said they will not change their position on Dow's sponsorship. The Games start in July.