nancy keenan, charmaine yoest. >> thank you. >> brown: finally tonight, new findings and charges in the investigation of the upper big branch mine disaster in west virginia. it was the deadliest in the u.s. in four decades: 29 men were killed on april 5th, 2010 after an explosion at the mine then owned by massey energy. today, state mining officials issued 253 violations against the company and released their final report. in it, they singled out two foremen saying they repeatedly failed to clean conveyor belts. or apply rock dust used to neutralize explosive coal dust all leading to unsafe conditions. just yesterday, federal prosecutors brought criminal fraud charges against the mine's former superintendent, gary may. we walk through the latest with npr's howard berkes. he's been covering this story since the accident. howard, welcome to you. so now we have this new state report. is the picture fairly clear on what happened that day? walk us through what we know. >> sure, the state report didn't really add much to what we already knew which was that this was a mine that was operated in