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It was the second time that Mr. Farrell had been held captive. In 2009, he was captured by the Taliban in Afghanistan and was rescued by British commandos.

Mr. Shadid worked previously for the Associated Press, The Washington Post and the Boston Globe. He won the Pulitzer Prize for international reporting in 2004 and 2010 for his coverage of Iraq.

Mr. Hicks, a former photographer for the Wilmington Star-News in North Carolina and the Troy Daily News in Ohio, was named Newspaper Photographer of the Year in 2007 by Pictures of the Year International and won an Infinity award from the International Center of Photography in 2001.

Ms. Addario also has worked for National Geographic and Time magazine and was part of the New York Times team that won the 2009 Pulitzer Prize for international reporting. She won a MacArthur Fellowship, known as the Genius Grant, in 2009.

Agence France-Presse, the French news agency, has said that two of its journalists and a photographer traveling with them went missing Saturday while working near the eastern city of Tobruk, not far from the border with Egypt. The AFP journalists are reporter Dave Clark and photographer Roberto Schmidt. They were accompanied by a photographer for Getty Images, Joe Raedle, who also is missing.

Several foreign journalists have been arrested by Libyan authorities during the uprising that began Feb. 15. An Al-Jazeera cameraman and a Libyan journalist have been killed.

Desmond Butler contributed from Washington, and Ulana Ilnytzky contributed from New York.