(CNN) -- Tension is high in Turkey as questions loom Friday over who is responsible for a suicide bombing at the U.S. Embassy in Ankara.

The blast happened on the same day that Secretary of State Hillary Clinton is leaving her job. Sen. John Kerry will fill that role amid widespread discussion at the department over security at its global posts following last year's attack on the U.S. post in Benghazi, Libya.

Republican Rep. Ed Royce, chairman of the House Foreign Affairs Committee, issued a statement saying that the bombing Friday is "yet another stark reminder of the constant terrorist threat against U.S. facilities, personnel and interests abroad."

"Coming after Benghazi, it underscores the need for a comprehensive review of security at our diplomatic posts," his statement said. "The committee stands ready to assist the State Department in protecting our diplomats."