U.S. Ambassador Killed in Libya: New Details

Some believe attacks that took life of Chris Stevens was planned in advance to coincide with 9/11.
3:00 | 09/13/12

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Transcript for U.S. Ambassador Killed in Libya: New Details
Llaama hasan, in cairo, thank you. Two warships are off the coast. And martha raddatz is tracking the latest details on what really happened in libya, that left a u.S. Ambassador and three americans dead. Good morning, amy. Overnight, u.S. Navy forces began moving those two u.S. Destroyers, armed with cruise missiles, to the coast of libya. Part of the heightened state of alert across the region. This is all still very volatile. The situation in libya is at a flash point. All nonessential u.S. Diplomatic workers have been ordered to leave the country this morning, as the fbi and other agencies try to figure out who carried out the malicious attack that killed ambassador chris stevens and three other americans. I want to assure you, we will bring their killers to justice. Reporter: The attack was complex and preplanned. Likely, for the anniversary of SEPTEMBER 11th. It was around 10:00 at night in libya. 20 heavily armed attackers began firing at the libyan security guards, protecting the american consulate, before setting the main building ablaze. Inside, ambassador stevens and several others were trapped between the flames and the gunfire. Stevens became separated from the others by the heavy, black smoke, while trying to exit the building. It was nearly a five-hour gun battle. Additional security eventually regained some control, while employees escaped. But the buildings are now abandoned. It was also nearly 12 hours before ambassador stevens' body was returned by local libyans, who carried him to a hospital in an effort to save him. A contingent of some 50 u.S. Marines is now at the embassy in tripoli this morning. Every u.S. Mission around the world has been ordered to reassess its security, beefing up where necessary. And these attacks, george, and protests are clearly continuing.

This transcript has been automatically generated and may not be 100% accurate.

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