Kuwaiti security sources said on March 19, 2003 that U.S.-led forces had moved into the Kuwaiti side of the demilitarized zone (DMZ) along the Iraq-Kuwait border, apparently in preparation for an invasion of Iraq. A U.S. military spokesman denied it. Tens of thousands of U.S. and British troops are in the desert in northern Kuwait preparing to attack. President George W. Bush has said his forces will invade if Iraqi President Saddam Hussein does not flee by early Thursday.