Four miners have been killed in a methane gas explosion at a coal mine in Colombia's central Boyaca province.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/colombia-mine-methane-blast-kills-four-boyaca
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/bbc-uk
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining-accident
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/colombia
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/methane
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/occupational-accidents
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/occupational-safety
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal