Shi'ite Houthi rebels deliver an ultimatum to Yemen's President Abd-Rabbu Mansour Hadi Friday:br br Form a new government within 10 days or face "other options", a spokesman tells a gathering of some 2,000 Houthi supporters in the capital Sanaa.br br It's not clear what those other options are.br br The Houthis captured Sanaa on September 21st, following weeks of anti-government unrest.br br Last month, a power-sharing accord was signed, aimed at bringing the Houthis into government.br br When a new administration is nominated, they are supposed to withdraw their forces from the city.br br But the looming deadline now raises tensions... in a political standoff that has crippled the country.