FBI Investigating Texas Man over Ricin-Tainted Letters

U.S. authorities are investigating a Texas man over threatening letters containing a potentially deadly poison mailed to U.S. President Barack Obama and New York Mayor Michael Bloomberg, a law enforcement official said on Friday.

The probe comes as FBI officials continue investigating a separate batch of ricin-laced letters sent earlier this month from Washington state to the president and four other targets, including the CIA and a military facility.

At this point, investigators do not think the two cases are connected, the source said.

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