U.S. Secretary of State Hillary Clinton has condemned “in strongest terms” the mob attack in Benghazi that killed the U.S. ambassador to Libya and three other members of the embassy staff. She says “heavily armed militants” set fire to the consulate building, and the attack should “shock the conscience” of all faiths.

In an address at the State Department Wednesday, she said “we have new heroes to honor” and mourn.

She said Stevens “risked his life to stop a tyrant,” referring to Moamar Gadhafi, and then gave his life to build a better Libya.

Clinton said the United States will continue to work with the government and people of Libya, but pledged to bring those responsible for the deaths to justice.