Nine people have died in an explosion at a coal mine in Sutatausa, north of Colombia's capital, Bogotá.Emergency workers said they had rescued six miners from the shafts and were continuing efforts to recover the bodies of those killed.Colombia's national mining agency said a build-up of gases was thought to have caused the blast at 16:00 local time on Monday.It also said it had inspected the mine less than a month ago and had warned operators about a potentially dangerous gas build-up.The regional fire department said crews were still working at the site.The incident adds to concerns about safety in... [Continue Reading]