As United States officials try to determine what role Al Qaeda may have had in recent attacks in Iraq, investigators and Special Forces are also pursuing two men known to have had previous connections to Osama bin Laden, American officials said this week. On a half-dozen occasions in recent weeks, one of the men, Abdul Rahman Yasin slipped through the net officials said. He has been indicted in connection with the World Trade Center bombing in 1993 and is on the F.B.I.'s most wanted terrorist list. He has been living in Iraq for about 10 years. The Americans have also...
