It was on the night of Dec 2-3, 1984, that a toxic gas leak from the Union Carbide Corporation's pesticide plant in the Madhya Pradesh capital killed and maimed thousands of people.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/29-years-later-bhopal-gas-victims-still-wait-justice
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/zee-news
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bhopal-gas-disaster
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madhya-pradesh
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hazardous-waste
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxic-wastes
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/union-carbide
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/compensation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-management
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bhopal