<p>WASHINGTON - U.S. intelligence agencies have launched a worldwide manhunt for al Qaeda's master bombmaker, who may be building a "dirty" bomb and other new devices for terror attacks inside the United States, sources said.</p>
<p>U.S. counterterrorism officials told The Post it was new information about the activities of Egyptian-born bomb maker Midhat Mursi, in part, that led the Bush administration to secretly dispatch Department of Energy radiological detection teams to New York and four other cities over New Year's Eve.</p>
