Support WBURQuestions Remain Year After W.Va. Mine ExplosionPlayDownload AudioHoward BerkesApril 09, 2011 ShareMine helmets and painted crosses sit at the entrance to Massey Energy's Upper Big Branch coal mine Tuesday in Montcoal, W.Va. The memorial honors the 29 coal miners who were killed in an explosion at the mine April 5, 2010. (AP)
