Iran May Seek to Mate Missile, Nuclear Warhead-US &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Saul Hudson&lt;/p&gt;&lt;p&gt; MANAUS, Brazil (Reuters) - The United States has seeninformation suggesting Iran is working on the technology todeliver a nuclear warhead on a missile, Secretary of StateColin Powell said on Wednesday.&lt;/p&gt;