<p>U.S. intelligence agencies say Osama bin Laden's oldest son, Sad, is in Iran along with other senior al Qaeda terrorists, as Iranian military forces have been placed on their highest state of alert in anticipation of a U.S. attack on Iraq, according to intelligence officials.</p>
<p>Sad bin Laden was spotted in Iran last month, according to officials familiar with intelligence reports. Sad is believed to be a key leader of the al Qaeda terrorist network since U.S. and allied forces ousted the ruling Taliban militia in Afghanistan.</p>