Pakistani protesters hold a banner depicting U.S. President Barack Obama and pastor Terry Jones during a rally in Peshawar, Pakistan as a part of widespread anger across the Muslim world about a film ridiculing Islam's Prophet Muhammad, on Thursday, Sept. 20, 2012. Hundreds of Pakistanis angry at an anti-Islam film that denigrates the religion's prophet clashed with police in the Pakistani capital Thursday, the most violent show of anger in a day that saw smaller demonstrations in Indonesia, Iran and Afghanistan. (AP Photo/Mohammad Sajjad)

A Pakistani protester reacts to tear gas fired by police, during clashes erupted as protestors tried to approach the U.S. embassy, in Islamabad, Pakistan, Thursday, Sept. 20, 2012. Hundreds of Pakistanis angry at an anti-Islam film that denigrates the religion's prophet clashed with police in the Pakistani capital Thursday, the most violent show of anger in a day that saw smaller demonstrations in Indonesia, Iran and Afghanistan. The vast majority of Muslims have not taken to the streets over a film mocking the Prophet Muhammad, and behind the visible public anger a more measured debate is taking place over how much free speech is acceptable in the Muslim world. While many do yearn for more openness, few if any will go as far as accepting the right to blaspheme as the ultimate test of freedom of speech. (AP Photo/Muhammed Muheisen)

President Barack Obama walks with Col. Michael Minihan from Marine One to board Air Force One, Thursday, Sept. 20, 2012, in Andrews Air Force Base, Md., en route to Florida. (AP Photo/Carolyn Kaster)

Pakistani protesters burn a representation of a U.S. flag and an effigy of President Barack Obama during a rally in Peshawar, Pakistan as a part of widespread anger across the Muslim world about a film ridiculing Islam's Prophet Muhammad, on Thursday, Sept. 20, 2012. Hundreds of Pakistanis angry at an anti-Islam film that denigrates the religion's prophet clashed with police in the Pakistani capital Thursday, the most violent show of anger in a day that saw smaller demonstrations in Indonesia, Iran and Afghanistan. (AP Photo/Mohammad Sajjad)