6:21PM ET: A letter addressed to an unknown Senator has been intercepted, containing Ricin, a potent chemical weapon. The envelope was tested three times with results positive for Ricin. No Further Details at this time. Updates as facts become available.
6:40 ET Letter addressed to Sen. Roger Wicker, R-MS. Possible suspect in custody. Letter being tested a 4th time in Maryland at this time.
17 APR 2013: A 2nd letter containing ricin has been intercepted, which was addressed to President Obama. Evidently the letters were postmarked Memphis, TN and contained the initials "KC."
The arrest of Paul Kevin Curtis, 45, related to the case, has been made in Tupelo, MS, apparently by the FBI, based on information provided by the DC Police.
23 APR 2013: Charges against Paul Kevin Curtis were dropped. No evidence of ricin had been found in any place the government had searched. No new suspect has been named.