The Arab Spring turned ugly in Libya and Egypt on Tuesday, as angry crowds stormed US diplomatic buildings. The US Ambassador to Libya - Christopher Stevens - was killed in an attack on the US consulate in Benghazi, Libya along with three other American diplomats when a rocket propelled grenade was shot into the building. Stevens is the first US Ambassador to be killed on duty in more than 30 years.The attack in Libya occurred just hours after angry protestors stormed the US Embassy in Egypt - climbing the walls, taking down the American flag, and hoisting up a black Islamic banner. Both attacks were believed to have been prompted by a movie made here in the United States by a California filmmaker who claims to be both American and Israeli. The movie depicts the prophet Muhammad as a fraudster and womanizer - something that is deeply offensive to the Muslim faith. The film was promoted by anti- Muslims organizations and a trailer for it was posted on Youtube sparking the outrage. However now - US officials believe that at least the attack on the consulate in Libya that claimed the life of Ambassador Stevens may have been pre-planned and executed by using the protests outside as a diversion. President Obama strongly condemned the attacks and Secretary of State Hillary Clinton released a statement saying, "we are heartbroken."