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Hani Mohammed, Associated Press
Yemeni policemen stand guard on a police vehicle at the main entrance of the closed U.S. embassy after Yemeni police opened the road in front of it in Sanaa, Yemen, Wednesday, March 4, 2015. Yemeni President Abed Rabbo Mansour Hadi called for the relocation of embassies to Aden, as several of the six-nation Gulf Cooperation Council members have done already. The U.S. ambassador to Yemen Matthew Tueller met with Hadi in Aden on Monday and said Hadi remained the "legitimate" leader of Yemen.

SANAA, Yemen — The U.N. envoy to Yemen has expressed "disappointment" over the refusal by the country's Shiite rebels to withdraw their fighters from state institutions and release the prime minister from house arrest.

The conditions were stipulated in a Security Council resolution seeking to help resolve the crisis roiling Yemen amid the power grab by rebel Houthis.

The U.N. envoy, Jamal Benomar, warned during a visit to the southern city of Aden on Wednesday that no single party "will be able to impose" control over all of Yemen.

Benomar spoke shortly after meeting with embattled Yemeni President Abed Rabbo Mansour Hadi, who fled from Houthis' house arrest and is establishing his base in Aden.

Hadi has also called for relocating embassies from the capital, Sanaa, now in rebel hands, to Aden.