From RadarOnline: The FBI is investigating a threat made against David Letterman after a poster to an online forum for radical Muslims urged others to "cut the tongue" of the late night funnyman for a joke he made on The Late Show.
The person who wrote the comment on Tuesday -- identified as "Umar al-Basrawi" -- told users of the Shumuka al-Islam forum to punish Letterman after he made a joke about dead al Qaeda leaders Osama bin Laden and Ilyas Kashmiri on his CBS show June 8.
