A powerful explosion has caused serious damage to Libya's foreign ministry building in the heart of the coastal city of Benghazi, security officials said.
The early morning blast also damaged the building next door housing the Benghazi branch of the Libyan Central Bank.
The officials said several passers-by were slightly injured by the blast, which blew out windows in nearby buildings.
The blast came exactly one year after al Qaida-linked militants stormed the US consulate in the eastern city of Benghazi, killing the US ambassador and three other Americans.
Both the bombing on Wednesday and last year's attack on the American consulate took place on the anniversary of the September 11 attacks.