Osama bin Laden delivers a 50-second speech on martyrdom in a video intercepted July 14 on its way to Islamist Web sites. The video appears to have been made in the last four weeks from older video clips, said Octavia Nasr, a CNN Arab affairs editor. The video is 40 minutes long and also includes a speech by former al Qaeda in Iraq leader Abu Musab al-Zarqawi, who was killed in 2006.