The U.S.-born radical Yemeni cleric, Anwar al-Awlaki, is calling for Muslims around the world to kill Americans.
In his latest video message, al-Awlaki said since all Americans are the enemy, clerics don't need to issue any special fatwas to allow them to be killed.
"Fighting the devil doesn't require consultation or prayers seeking divine guidance. They are the party of the devils," he said.
In the 23-minute Arabic language message, he also said that for Americans and Muslims, it is "either us or them."
Al-Awlaki has ties to the 9/11 hijackers and previous U.S. attacks.