Haz-mat teams and federal investigators responded across Oregon on Monday after numerous sheriffs received suspicious mail, some of it delivering an unknown substance, authorities told NBC News.
Beth Anne Steele, a spokeswoman for the FBI, told NBC News that it had joined Oregon State Police and the U.S. Postal Inspection Service in investigating suspicious mail deliveries at multiple locations.
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"At this point, it is too early to say where this investigation may lead," she said.