Federal Bureau of InvestigationOne of the letters sent to a Chase branch, accompanied by a white powder later ruled to be calciumLast night, the U.S. Attorney's Office sent word that at 11 a.m. today there would a media conference at the Earle Cabell Federal Building downtown "to announce developments in a pending investigation." This morning, a second missive arrived with further details: Acting U.S. Attorney James Jacks; Robert Casey Jr., the Special Agent in Charge of the FBI's Dallas office;
