Another ricin letter found in US

The letter was discovered at Bolling Air Force Base outside Washington on Tuesday, a week after three letters were intercepted on their way to US President Barack Obama, a US senator, and a Mississippi judge.
 
"We've had another incident today, I'm told, at Bolling Air Force Base, the same substance," Senator Harry Reid said.
 
According to the Defense Intelligence Agency, which is headquartered at Bolling, the letter was intercepted in a mail handling facility.
 
Initial tests "indicate possible biological toxins," the DIA announced in a statement.
 
"Prudent screening methods and force protection measures were implemented to prevent personnel from being harmed," the DIA said, adding that it has "maintained normal operations."
 
Also on Tuesday, according to testimony from an FBI agent, investigators could not found any ricin in the house of a man accused of mailing poisoned letters to Obama, Republican Senator Roger Wicker of Mississippi, and a justice of the peace in the same US state, Sadie Holland.
 
Last week, the FBI arrested Paul Kevin Curtis, 45, at his home in Corinth, Mississippi and charged him with threatening the life of the president.
 
Curtis was released on bond on Tuesday.
 
His lawyer, Christi McCoy, claimed that the FBI captured the wrong man.
 
"We have maintained from the beginning… that Kevin Curtis is absolutely 100 percent innocent," McCoy stated. "The case has not been dismissed, but obviously we feel better about it than we did this time yesterday."