MORGANTOWN, W.Va. -- The sole survivor of the West Virginia mine disaster remains in critical condition with a collapsed lung and dehydration.

But doctors in Morgantown said 26-year old Randal McCloy shows no signs of brain damage or carbon monoxide poisoning after being trapped for more than 42 hours.

McCloy was the youngest miner and that may have contributed to his survival.

McCloy and 11 others were found at the deepest point of the mine, about 2.5 miles from the entrance. They were behind a fibrous plastic cloth stretched across an area about 20 feet wide to keep out deadly carbon monoxide gas. The body of a 13th miner was found earlier.

McCloy, who remains in intensive care, has been undergoing dialysis because of damage to his kidneys. A doctor said McCloy squeezed his wife's hand and has communicated with other movements.

It doesn't appear the explosion killed them, mine officials said. No one is sure yet how long they remained alive.

CEO Regrets Allowing False Hope

The head of the company that owns the coal mine said Wednesday afternoon the company "sincerely regrets" that families erroneously believed for three hours that their loved ones were alive.

Ben Hatfield, CEO of Sago Mine owner International Coal Group, said about 45 minutes after an initial erroneous report that 12 miners had survived, word came that all but one of the miners were dead.

He added the immediate reaction was that the report could be wrong, and he said company officials didn't feel it was prudent to pass that along to families without being sure.

"In the process of being cautious, we allowed the jubilation to go on longer than it should have," he said.

Hatfield also said that at some point, word was sent to clergy inside the church where the families were waiting, that the initial report may have been too optimistic. He said that message never got to the family members.

Relatives had broken out in screams of joy when word of a rescue came from West Virginia's governor in the middle of the night. That was replaced by abject sorrow and anger.

The son of one of the 12 miners found dead said there was "no apology" and "no nothing" when officials told them their relatives were dead.

The company news conference announcing the miscommunication didn't occur until after 3 a.m. -- more than three hours after families had started celebrating the misconception that their loved ones were alive.

Witnesses said after people were given the bad news about the others, one relative became enraged and lunged at an official. The incident happened at a Baptist church where relatives had gathered. Family members had to wrestle the aggrieved man to the ground.

Federal officials are expressing sorrow over the deaths and are promising a full investigation.

Bush: Nation Mourns Tragedy

President George W. Bush said the nation is mourning those who lost their lives.

On a visit to the Pentagon, the president told reporters, "We ask that the good Lord comfort them in their time of need."

Bush praised West Virginia Gov. Joe Manchin, as well as rescue workers who, he said, "risked their lives" for those trapped underground.

The administration is also vowing a full investigation of the Monday explosion.

Labor Secretary Elaine Chao said federal officials would determine the cause and ensure there's no repeat.

White House spokesman Scott McClellan defended the Bush record on mine safety, saying it's been a top administration priority.