Nightly News   |  April 23, 2013

Prosecutors drop charges against Ricin letter suspect

Kevin Paul Curtis, the Mississippi man charged with mailing ricin-laced letters to President Obama and Sen. Roger Wicker said the past week has been a “nightmare” and he “would never do anything to pose a threat” to Obama or any other official. NBC’s Andrea Mitchell reports.

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>>> when we last reported on this next story last night, a former elvis impersonator had been arrested for sending letters laced with ricin to a senator and president obama . this already strange story changed again today. nbc's andrea mitchell tracking it again tonight. good evening.

>> reporter: good evening, there are a lot of questions about that ricin investigation. tonight in mississippi, a federal magistrate released paul kevin curtis . tonight prosecutors dropped all charges against him. curtis, an occasional elvis impersonator , had been arrested on charges of sending those letters but investigators say the fbi found no evidence of ricin when they searched his home. he's been in jail since last week. today the fbi also searched a second mississippi location. the tulela home of an acquaintance and sometimes adversary of curtis mep says that he's innocent. another incident, the defense intelligence agencies say alarms went off today at a mail facility at bolling air base here in washington indicating the possible presence of dangerous toxins. further tests found no specific package related to those alarms, so they're taking more samples. bottom line, the fbi got the wrong man in first case and whoever is sending these hers may still be out there.

>> andrea mitchell with an update