A Taliban power struggle is underway in Pakistan.

U.S. and Pakistani officials say there's growing evidence that last week's U.S. missile strike did kill Pakistani Taliban chief Baitullah Mehsud.

Mehsud has led a bloody campaign of suicide attacks and assassinations against the government of Pakistan.

Now Pakistan is worried that al Qaeda is trying to install its own "chief terrorist." And there appears to be infighting among top Taliban leaders.

Reports indicate one or two of the top contenders were killed in a major gun battle between rival Taliban factions.