The suspect has been identified: Kenneth Curtis of Tupelo Arrested in Connection With Ricin Letters.

Federal sources have confirmed to The Clarion-Ledger that Kenneth Curtis of Tupelo has been arrested in connection with letters laced with ricin that were sent to Sen. Roger Wicker and President Barack Obama.

Federal authorities were in Tupelo on Wednesday investigating the letters. Both letters were signed: “I am KC and I approve this message.”