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Armed Yemeni militiamen loyal to President Abedrabbo Mansour Hadi, also known as the Popular Resistance Committees, sit on tanks, one flying the separatist Southern Movement flag, outside the Yemeni special forces command base in the southern city of Aden on March 19, 2015.
Armed Yemeni militiamen loyal to President Abedrabbo Mansour Hadi, also known as the Popular Resistance Committees, sit on tanks, one flying the separatist Southern Movement flag, outside the Yemeni special forces command base in the southern city of Aden on March 19, 2015.

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    U.N. Envoy: Yemen at edge of civil war

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U.N. Envoy: Yemen at edge of civil war

CNN Senior International Correspondent Nic Robertson examines the troubling political situation in Yemen.

U.N. Envoy: Yemen at edge of civil war

CNN Senior International Correspondent Nic Robertson examines the troubling political situation in Yemen.