IntroductionOn June 12, less than a week after a U.S. air strike killed Abu Musab al-Zarqawi, the al-Qaeda in Iraq website announced the appointment of the group’s new leader, Abu Hamza al-Muhajir.

BAGHDAD, Iraq (CNN) -- The U.S. military said Tuesday it has seized a letter from Iraqi insurgents believed to be intended for Jordanian-born militant Abu Musab al-Zarqawi complaining about low ...