By CNN Foreign Affairs Reporter Elise Labott

The Libyan government will not allow the FBI into Benghazi to arrest suspects for last year's deadly terror attack on the U.S. diplomatic mission, a top State Department official told a House panel on Wednesday.

Federal authorities have filed charges against suspects in connection with the September 11 attack on the mission and nearby CIA annex that killed Ambassador Christopher Stevens and three other Americans.

But Republicans on the House Foreign Affairs Committee said they were shocked nobody has been brought to justice.

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