Ricin letters, Boston bombing raises fears on Capitol Hill

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"The arrest was made on a suspect named Paul Kevin Curtis. He's the one who sent the three letters, two of which were sent to President Obama and Sen. [Roger] Wicker (R-Miss.]," Strauss said.

Curtis of Corinth, Miss., faces as many as 15 years in prison, three years of supervised release and a $500,000 fine under the federal charges, which were announced Thursday by U.S. Attorney for the Northern District of Mississippi Felicia C. Adams and Daniel McMullen, the FBI special agent in charge of overseeing the case.

Strauss pointed out that there's "definitely a higher sense of apprehension" on Capitol Hill about the letters and bombings, leading to fears of other suspicious packages, which turned out to be benign.

Read more about arrest and fallout from the ricin-laced letters on The Hill's Blog Briefing Room.