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Libyans gather outside a foreign ministry building that was damaged by a powerful blast on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522780033 )

Libyan men flash the sign of victory in front of a foreign ministry building (background) that was damaged by a powerful blast on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522780286 )

Libyan firefighters battle to extinguish a fire caused by a powerful blast near a foreign ministry building on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522779857 )

A Libyan firefighter waters the inside of a foreign ministry building that was damaged by a powerful blast on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522780298 )

A Libyan man shows a dead bird in front of firefighters extinguishing a fire caused by a powerful blast near a foreign ministry building on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522779806 )

Libyans gather outside a foreign ministry building that was hit by a powerful blast near on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522780210 )

Libyans gather near the remains of a burnt car on the site of a powerful blast near a foreign ministry building on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522780181 )

Libyans gather outside a foreign ministry building that was damaged by a powerful blast on September 11, 2013 in the eastern Libyan city of Benghazi. The explosion comes on the first anniversary of an attack by militants on the United States consulate in Benghazi, which killed four Americans, including the ambassador. ABDULLAH DOMA/AFP/Getty Images ( 522780167 )

People gather at the site of a car bombing in Benghazi, Libya, Wednesday, Sept. 11, 2013. A powerful car bomb exploded Wednesday near Libya's Foreign Ministry building in the heart of the eastern coastal city of Benghazi, security officials said, one year to the date after an attack there killed the U.S. ambassador and three other Americans. The early morning blast targeted a building that once housed the U.S. Consulate under the rule of King Idris, who former Libyan dictator Moammar Gadhafi overthrew in a 1969 bloodless coup. (AP Photo/Mohammed el-Shaiky) ( Mideast Libya )