Reactions to Monday's explosion at Performance Coal's Upper Big Branch Mine-South:
"This is devastating news and our hearts and prayers go out to the families of the miners who have died. We are offering everything we can to assist those families at this time.
"For those families who are still waiting for news on their missing loved ones, I want them to know that we are doing everything possible in cooperation with federal officials and the company to get our miners out as quickly and safely as possible.
"I just spoke with President Obama and he has promised to make every asset available to help us and we will be in contact as the rescue continues. We are all working diligently together and I ask that everyone pray for the miners, their families and our rescue teams."
Gov. Joe Manchin
"I am praying for these miners, their loved ones, and for those who still may be trapped. Tragically West Virginians have considerable experience dealing with these disasters in the coal mines. And we know every second counts. My utmost hope is that our experienced and well trained mine rescue teams and first responders will be able to keep further casualties to a minimum."
Sen. Robert C. Byrd, D-W.Va
"Sharon and I are heartbroken along with the community by the tragic news unfolding of the explosion at Upper Big Branch South mine -- we are sending all of our prayers and thoughts to the brave miners and their families.
"I know our dedicated first responders and local community members are doing everything they can to rescue as many people as possible and I thank them for their incredible efforts.
"I am working with state and federal officials to get as much information as possible and I am doing all I can to help make sure all resources are made available for this rescue effort."
Sen. Jay Rockefeller, D-W.Va.