Curtis’s attorney, Christi McCoy, has maintained that her client is innocent. She said Tuesday that “it took a lot of planning, determination and patience” to carry out the ricin attacks.
“That is so not Kevin, to spend hours focused on making ricin,” she said.
Calls to Curtis’s father, brother and ex-wife were not returned Tuesday afternoon.
Curtis was arrested at his home last Wednesday and charged with sending letters containing ricin to President Obama, Sen. Roger Wicker (R-Miss.) and a county judge in Mississippi. The first letter, to Wicker, was discovered April 15.
According to an FBI affidavit supporting the charges, Curtis allegedly mailed three identical letters on yellow paper laced with a poison thought to be ricin. The letters alluded to a long-held conspiracy theory about the trafficking in human body parts that Curtis had sought to expose.
White House spokesman Jay Carney, when asked about the ricin case, referred questions to the FBI.
Ricin is made from castor beans, and authorities have long worried about its use by terrorists and others. But FBI agents testified this week that they found no castor beans at Curtis’s house nor any information on his computer that he was researching the poison.
Earlier Tuesday, Senate Majority Leader Harry M. Reid (D-Nev.) told reporters that there was another “alleged ricin incident” at Joint Base Anacostia-Bolling in Southeast Washington, but he could not provide additional details. Jacqueline Maguire, an FBI spokeswoman, said the bureau was investigating a suspicious letter at the Air Force base but had no further information.
But the Defense Intelligence Agency released a statement late Tuesday saying that no suspicious packages or letters had been found.
“Today, DIA’s mail screening equipment alerted officials to the possible presence of a potentially harmful substance,” Lt. Col. Thomas Veale, a DIA spokesman, said in the statement. “After thorough on-scene investigation, no suspicious packages or letters were located. The FBI took samples and will conduct further testing off-site.”
Asked at the news conference what his immediate plans were, Curtis said: “Find my dog, Moo Cow. Moo Cow got away when Homeland Security swarmed in on me when I went to check my mail. I haven’t heard anything. I’m just really worried about her. . . . My brother has found Moo Cow! . . . She’s an amazing dog. I want to get to her. I want to get to my children. I haven’t seen any of my children in a week.”
Ed O’Keefe, Aaron C. Davis and Julie Tate contributed to this report.