In September, 2002, the Bush administration announced that the United States would preemptively use military force if necessary to prevent threats to its national security by terrorists or "rogue states" especially any that possessed weapons of mass destruction. Based on what would prove to be inaccurate intelligence reports, the Bush administration successfully obtained a UN Security Council resolution to return weapons inspectors to Iraq. Soon afterward, Bush declared that Iraq hadn’t complied with inspections, and on March 20, 2003, the United States launched a successful invasion of Iraq, quickly defeating the Iraqi military. Baghdad, the Iraqi capital, fell on April 9, 2003, and Bush personally declared an end to major combat operations on May 1, 2003. With a power vacuum in place, Iraq soon fell into a sectarian civil war.