CNN is reporting a Jihadist website is urging its American followers to kill Late Night host David Letterman, over remarks he made in June about an al Qaeda leader killed in Pakistan .

Letterman's remarks were reportedly about Ilyas Kashmiri, described as al Qaeda's "military brain," who was killed by a drone strike in June. Letterman was said to have, cracked jokes about the killing.

The death threat urges jihadist followers to cut off Letterman's tongue and "shut it forever."

The FBI, says it takes such threats seriously, and is investigating.

(From CNN)