WASHINGTON -- The FBI arrested a Mississippi man Wednesday in connection with letters mailed to President Barack Obama and Republican Sen. Roger Wicker that tested positive for the poisonous substance ricin.
Agents arrested Paul Kevin Curtis around 5:15 p.m. EDT at his home in Corinth, Miss., alleging that he’s responsible for the mailings of three letters that contained a granular substance that preliminarily tested positive for ricin.
FBI officials said three letters were sent to Obama, Wicker and a Mississippi justice official identified by law enforcement officials only as a judge. Curtis, about 46 years old, wasn’t immediately charged.
The evening arrest capped a multi-agency investigation into a spate of potentially poison-laced letters and packages Wednesday meant for Obama and Wicker and the state official.
Investigators appeared to focus quickly on Curtis, who they believed sent letters with hateful rhetoric to members of Congress in the past. His wording was similar to the language in the new letters, said a law enforcement official familiar with the inquiry who spoke on the condition of anonymity because of the sensitive nature of the material.
In one of the letters, the official said, the mailer wrote, “No one listened to me before. This must stop. To see a wrong and not expose it is to become a silent partner to its continuance. I am KC and I approve this message.”
The arrest capped a two-day period in which the news of letters to Obama and Wicker containing the toxic and potentially lethal poison combined with Monday’s Boston Marathon bombings to put government offices on alert and on edge. Congressional offices in two Senate office buildings were cordoned off briefly over concerns about suspicious packages, and the offices of senators in Michigan and Arizona reported receiving suspicious letters. None of the others tested positive for ricin or other poisons, according to another law enforcement official, who lacked the authority to speak publicly and insisted on anonymity.
In Washington, a letter sent to Obama that was intercepted Tuesday at a remote Secret Service mail-screening center contained a granular substance that tested positive for potentially lethal ricin. The letter addressed to Wicker was intercepted at an offsite postal facility that screens congressional mail. It was unclear Wednesday whether the Mississippi judge personally received a letter.
“The envelope was immediately quarantined by U.S. Secret Service personnel, and a coordinated investigation with the FBI was initiated,” the FBI said of the Obama letter. “Anytime suspicious powder is located in a mail facility, field tests are conducted. The field and other preliminary tests can produce inconsistent results.”
While 24-hour tests at a Maryland laboratory confirmed that the three letters contained ricin, additional tests must be conducted to determine whether the substance was extracted in a way that enhanced its potency to make it truly dangerous if tiny amounts were inhaled or ingested, one of the law enforcement officials said.
Obama was briefed Tuesday night and again Wednesday morning. White House Press Secretary Jay Carney said the FBI hadn’t made any connection between the letters and the explosions Monday in Boston.
“Before we speculate or make connections that we don’t know exist, that the FBI has made a clear statement about, we need to get the facts,” Carney said.