Men reach for food being thrown to them while they wait to enter Tunisia from Libya in the border town of Ra's Ajdir, March 1. U.N. officials say Tunisia cannot cope with the thousands of refugees entering the fragile nation. Spencer Platt/Getty Images hide caption

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Men reach for food being thrown to them while they wait to enter Tunisia after fleeing Libya, March 1, in Ras Jdir, Tunisia. Spencer Platt/Getty Images hide caption

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A gunman beckons foreign journalists inside barricades so they can see the main square of Zawiya, west of Tripoli. Reporters have had difficulty both entering Libya and traveling freely once in the country. Ben Curtis/AP hide caption

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A volunteer soldier waves cars through a checkpoint in Ajdabiya on Tuesday. Trevor Snapp for NPR hide caption

itoggle caption Trevor Snapp for NPR

Yemeni President Ali Abdullah Saleh gives a speech at Sanaa University on Tuesday as vast numbers of protesters poured into a nearby square for a massive anti-regime rally. Mohammad Huwais/AFP/Getty Images hide caption

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"One of those actions that is under review is a no-fly zone" in Libya, Secretary of State Hillary Rodham Clinton told the House Foreign Affairs Committee. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Staff members of Al-Jazeera prepare for a broadcast in Doha, Qatar. Deborah Amos/NPR hide caption

itoggle caption Deborah Amos/NPR

Palestinian chief negotiator Saeb Erekat resigned in the wake of the leak of thousands of documents to Al Jazeera. But some say his resignation was also prompted in part by the broader turmoil in the Arab world. Manuel Balce Ceneta/AP hide caption

itoggle caption Manuel Balce Ceneta/AP

Libyan anti-government fighters sit by a fire to stay warm as they control a checkpoint on the outskirts of the southwestern town of Nalut, Libya, Monday. The town is currently in control of the Libyan anti-government forces. Lefteris Pitarakis/AP hide caption

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A Gadhafi supporter simulates the salute portrayed in a photograph of Libyan Leader Moammar Gadhafi, as he and others stage a small rally on the stage of the Roman amphitheatre at the Sabratha archaeological site. Ben Curtis/AP hide caption

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