A letter addressed to President Obama that may have been contaminated with the deadly toxin ricin is similar to two ricin-laced letters recently sent to New York City Mayor Michael Bloomberg, the Secret Service said Thursday.
A screening facility for mail sent to the White House intercepted the recent letter sent to Mr. Obama, Secret Service spokesman Edwin Donovan said. The letter has been turned over to the FBI's joint terrorism task force for testing and investigation.
CBS News correspondent Bob Orr reports that the letter was postmarked from Shreveport, La.
Shreveport was also the postmark for the two contaminated letters sent to Bloomberg in New York and his gun-control group in Washington.