The rule of the Islamic Emirate of Afghanistan came to an end in 2001 following the United States invasion. In May and June 2003, senior Taliban officials proclaimed the Taliban regrouped and ready for guerrilla war to expel US forces from Afghanistan. In late 2004, the then hidden Taliban leader Mohammed Omar announced an insurgency against "America and its puppets" (i.e. transitional Afghan government forces) to "regain the sovereignty of our country".