Afghanistan's president has renewed his calls for calm in a televised address to the nation after the burning of Holy Qurans at a U.S. base sparked five days of violent protests. About 30 people have been killed including four U.S. soldiers since the incident came to light Tuesday. NATO has pulled hundreds of international advisers out of Afghan ministries out of concern that they might become the next targets of anti-foreigner anger. President Hamid Karzai spoke in a live television broadcast Sunday. Karzai said, "Now is the time to return to calm and not let our enemies use this situation."