Violence against America in the Muslim World

US Marines have arrived in Libya and FBI agents are on their way in the aftermath of the armed attack that killed Ambassador Christopher Stevens. Libya has arrested four people and says others are under surveillance, but why did the attack occur where the US is popular for liberating the country? In the meantime, protesters are outside embassies in Cairo and Yemen's capital, Sana'a, and there's growing concern about protecting American personnel. We hear that anti-American anger goes well beyond spontaneous outrage over a crude and blasphemous film.