In China , 21 miners have been killed in a gas blast incident and 21 are still trapped in a state run mine in Henan Province. Rescuers said they were fighting tons of coal dust to reach the miners, who have been located but whose condition was unknown.The rescuers also faced dangerous gas levels and the risk of falling rocks as they worked their way into the mine pit. The Incident occurred on Saturday as workers were drilling a hole to release pressure from a gas buildup to decrease the risk of explosions.The explosion in central China happened as the world still was celebrating Chile's successful rescue of 33 miners trapped more than two months.