The United Nations Security Council has unanimously adopted a resolution demanding that Shiite rebels immediately relinquish control of Yemen's government in a crisis that has pushed the Arab world's poorest country near collapse. Arab countries have been pressing for the use of military force against what they call the rebel group's "illegitimate seizure of power." But the resolution approved on Sunday by all 15 council members at an emergency meeting does not act under Chapter 7 of the UN Charter, which would allow it to be militarily enforced. The resolution, co-sponsored by 10 countries including the United States, demands that the Houthi rebels "immediately and unconditionally" withdraw forces from government institutions and engage "in good faith" in UN-led peace talks. "It was clear the world was waiting for a powerful message from the UN Security Council," said British Ambassador Mark Lyall. "The Houthis must take responsibility for their actions and stop using violence and coercion as political tools." It was the council's first resolution on Yemen since the current crisis with the rebels began. "This resolution is overdue," New Zealand Ambassador Jim McLay said. He called the Houthi takeover a "coup d'etat". The Houthis' takeover that began with seizing the capital, Sanaa, in September has raised alarms that the world's most dangerous branch of al-Qaeda, based in Yemen, would use the chaos to its advantage. The Houthis and the militant Sunnis of the al-Qaeda branch are bitter rivals. Worried Shiite powerhouse Iran is backing the rebels, foreign ministers of the largely Sunni six-nation Gulf Cooperation Council on Sunday urged the UN to intervene. They warned if the world fails to respond they were prepared to take action on their own. They did not elaborate on what measures the group might take. The resolution also demands that the Houthis release US-backed President Abed Rabbo Mansour Hadi and his cabinet from house arrest. Hadi resigned last month after the rebels had dissolved the parliament in Sanaa.