It has been confirmed that one of the deaths in the Libya attack on the U.S. consulate is U.S. Ambassador to LibyaChristopher Stevens, 52. The death toll is now up to four from two this morning after further investigation. Click below to read more.

Jason J.

U.S. ambassador to Libya Christopher Stevens was killed when Libyan militants stormed the U.S. consulate in Benghazi Tuesday night.

Stevens, 52, died as 20 gun-wielding attackers descended on the U.S. consulate, firing automatic weapons and rocket-propelled grenades, Libya’s Deputy Interior Minister Wanis al-Sharif told a news conference in Benghazi.

Nearly a dozen Americans were inside the consulate at the time, guarded only by Libyan security. For nearly 20 minutes the Libyan guards exchanged fire with the attackers, who hurled a firebomb inside.

The militants burned down at least one building in the attack. It’s not clear whether Stevens was killed by smoke inhalation or was in a car, which may have been hit by a mortar, as he tried to escape.

Foreign Service Information Management Officer Sean Smith died from smoke inhalation during the attack.

Two more Americans, possibly guards who were trying to get Stevens out of the area, were also killed. U.S. officials are still making next of kin notifications, according to a statement from Secretary of State Hillary Clinton.

It’s not clear what triggered the attack. Protesters in Egypt on Tuesday scaled the walls of the U.S. embassy and tore down the American flag in an angry demonstration against a movie about the life of the Prophet Muhammad, depicting the found of Islam as a fraud and a womanizer. It’s not certain whether the movie was a factor in the Libyan consulate attack.

“I strongly condemn the outrageous attack on our diplomatic facility in Benghazi, which took the lives of four Americans, including Ambassador Chris Stevens,” President Obama said in a statement. “Right now, the American people have the families of those we lost in our thoughts and prayers. They exemplified America’s commitment to freedom, justice, and partnership with nations and people around the globe, and stand in stark contrast to those who callously took their lives.

Stevens, who was a career member of the Senior Foreign Service and served two tours of duty in Libya, began his term of appointment on May 22, and he was in Libya during the uprising that deposed Col. Muammar Qaddafi, serving as the American representative to the transitional national council.

The U.S. is now evacuating all Americans from Benghazi who were working with the State Department, and the U.S. is bracing for more attacks in the Middle East.

ABC News