Ambassador's bodyguards also reported killed
Al-Jazeera has some more details of the consulate attack:

The ambassador was paying a short visit to Benghazi when the consulate came under attack on Tuesday night, Al Jazeera's Suleiman Idrissi reported from the eastern Libyan city.

He died of suffocation during the attack, along with two US security personnel who were accompanying him, security sources told Al Jazeera. Another consulate employee, whose nationality could not immediately be confirmed, was also killed.

Two other staffers were injured, Idrissi reported.

The bodies of the dead were transported to the Benghazi international airport, to be flown to Tripoli and then onwards to a major US airbase in Germany.

There are conflicting accounts of what happened in Benghazi. One of the demonstrators told the Libya Herald that the protest was entirely peaceful until the police and local security forces tried to end it by firing into the air. That angered the protestors who then turned on the police, the demonstrator claimed. One of them, he said, then went to his car, got out a rocket propelled grenade launcher and fired at a police vehicle. However, he missed and the RPG hit the building on Venezia Street instead.

Other witnesses give a very different account. One, a Benghazi bank official who did not want to be named, told the Libya Herald that the protestors were all Salafists who had turned up to the building intent on causing maximum damage, bringing guns and RPGs with them. He claimed members of the Islamist militia Ansar Al-Sharia were among them. He said that fierce clashes between them and security forces lasted for five hours. He confirmed that the protestors had got into the building.

According to him, the police guarding the office had allowed the protestors into the consulate. They then forced those inside to leave before trying to set the building on fire.

http://www.guardian.co.uk/world/middle-east-live/2012/sep/12/libya-egypt-attacks-muhammad-film-live?commentpage=11#start-of-comments

Rick9: yawa don gax. Oya. U. S start flying drones to Libya, thats what u know how to do bext.

ehie: the price of liberation..
America,France haha
how is your liberation of the Middle east working out for you now.
They just had to kill Gadafi and Hussein.
You guys reap what you sow

Dont forget to keep arming the cia agents called Rebels in Syria...haha
Stupeed Americans

logica: Patiently waiting for their brothers to launch their attack in Nigeria.

savedbreak: Seun may ban us but each of us have upto 5 i.ds so we can neva b wiped out!

akereconfi: Why is it that Terrorism is """always"" associated wf ISLAM......?

ismhab: ANY BODY WHO HAD HAND IN GHADDAFI'S DEAD, BY THE GRACE OF GOD HE WILL DIE THE WAY GHADDAFI WAS KILLED.