A police officer reacts after teargas was used to break up a protest in Tunis February 6, 2013. Tunisian police fired teargas to disperse protesters demonstrating in the capital outside the Interior Ministry against the killing of a prominent secular opposition politician on Wednesday, witnesses said.

John Kerry (left) is sworn in as U.S. Secretary of State by Vice President Joe Biden during a ceremony at the State Department in Washington, Feb. 6, 2013. The ceremony was a re-enactment of the official swearing-in conduced on Feb. 1.

Spain's Prince Felipe salutes as he attends the decommissioning ceremony of the aircraft carrier bearing his own name, the Principe Asturias, in Rota, southern Spain February 6, 2013. The Spanish navy will decommission the Principe Asturias as modernizing the ship which has been in service since 1988 was considered too expensive.

Newly initiated Naga Sadhus or Hindu holy men of the Juna Akhara attend the Dikasha ritual on the banks of the river Ganges during the ongoing "Kumbh Mela", or Pitcher Festival, in the northern Indian city of Allahabad February 6, 2013. During the festival, Hindus take part in a religious gathering on the banks of the river Ganges. The festival will return to Allahabad in 12 years.

German electronic band Kraftwerk perform with a 3d stage set at the Tate Modern in London February 6, 2013.

Protesters hold banners with sign "No U Turn" meaning "No Returning Back" and hold Bahraini flags as they participates in a rally organised by Bahrain's main opposition society Al Wefaq, in Budaiya west of Manama, Bahrain, February 6, 2013.