Mine Explosion-Survivor

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His doctors say the only survivor of this week's coal mine explosion in West Virginia is in a coma, but showing some encouraging signs.

Doctor Lawrence Roberts tells ABC Randal McCloy is struggling with the effect of oxygen deprivation to his brain and other vital organs. He says doctors think McCloy suffered a minor brain injury, but it will take time to see how well he recovers.

Another doctor tells CBS there's been "some improvement" in McCloy's heart and lungs.

The miner's mother tells CNN it seems her son is moving more and "he's aware" of his loved ones in the hospital. And his stepfather says McCloy is "fighting every second to get stronger."

But Doctor Roberts -- who had said earlier that McCloy was able to squeeze his wife's hand -- now says no such response is being seen.

The mine accident killed 12 other workers.