Ambassador Christopher Stevens and three other Americans were killed in an attack on the U.S. consulate in Libya. President Obama condemned the "outrageous attack." He ordered heightened security at American embassies and consulates around the world. "I was deeply disturbed and saddened to learn of the deaths of Ambassador Chris Stevens and three other American consular personnel," said Sen. Bernie Sanders on Wednesday. "I join President Obama in condemning the senseless acts of violence at our diplomatic post in Benghazi. The families of the four Americans who were serving our country are in our thoughts and in our prayers."