(CBS) Ayman al-Zawahiri - the second most powerful leader in al Qaeda and Osama Bin Laden's No. 2 - may be critically wounded and possibly dead, CBS News chief foreign affairs correspondent Lara Logan reports exclusively.
CBS News has obtained a copy of an intercepted letter from sources in Pakistan, which urgently requests a doctor to treat al-Zawahiri. He's believed to be somewhere in Pakistan's remote tribal areas of Pakistan.
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