<p>MOSUL, Iraq — All day, glaziers from Sheik Nawaf al-Zaydan Muhhmad's contracting firm had been working on the windows of their employer's ornate, three-story villa on the boulevard of Al Falaha in Mosul.</p>
<p>Mukhlis Jubori, Mr. al-Zaydan's next-door neighbor and closest friend, was curious. The windows did not need replacing and glass has been scarce since the war. Where was Mr. al-Zaydan, he wondered? He had not seen him for almost three weeks.</p>