Blown apart tree?

For message board discussion. Try and figure this one out. Yesterday on our climb we came across a tree that was freshly blown apart. Another tree did not fall on it. It is very unlikey from the wind because it was in the middle of a dense forest and no other trees were affected. There were also dead trees around this one and if it was the wind, it would have taken out those ones first. My thought is that it had to be lightning, but it was strange that there were no burn marks or any sign of burning. I guess I'd have to go with lightning as being the only possible cause. Any other ideas?