MORGANTOWN, W.Va. (AP) - A report is due Tuesday on how federal regulators handled problems at the Upper Big Branch mine before the 2010 explosion that killed 29 men.
The Mine Safety and Health Administration will discuss its findings privately with victims' families in Beaver, then post the document online later in the morning.
Many relatives and several investigation reports have criticized both state and federal regulators for failing to prevent the worst U.S. coal mine disaster in four decades.
MSHA officials insist that inspectors used the tools they had and were trying to correct problems. They shut the mine down 48 times in the year before the blast but let it reopen when problems were fixed.
MSHA also insists that Massey Energy could have prevented the blast with proper safety inspections and maintenance.