suspicious letter

At approximately 5:15 p.m. Wednesday, FBI special agents arrested Paul Kevin Curtis, the individual believed to be responsible for the mailings of the three letters sent through the U.S. Postal Service which contained a granular substance that preliminarily tested positive for ricin. The letters were addressed to a U.S. senator, the White House, and a Mississippi justice official.

The U.S. Secret Service confirmed it intercepted a letter addressed to President Barack Obama that contained a “suspicious substance.”
 
Secret Service spokesman Ed Donovan said the letter was intercepted at a facility away from the White House. He said the letter was also received Tuesday. […]