TAHLEQUAH, Okla. - Part of the Cherokee County Courthouse was forced to evacuate Tuesday after a judge's office received a threatening letter, according to authorities.
A secretary opened the letter, which was addressed to the district judge.
"The letter contained a threatening message and the envelope the letter came in had some suspicious white powder inside of it," said Cherokee County Undersheriff Jason Chennault.
Chennault says the substance was determined to be talcum powder, a cosmetic product used to aid diaper rashes.
Chennault said the letter included a reference to the recent high-profile deaths of district attorneys in Texas.
The threatening letter comes less than a week after authorities say someone called a bomb threat into the courthouse, which forced an evacuation of the entire building.
READ: 'Authorities investigating bomb threat at courthouse' (http://bit.ly/courtevac)
Authorities have not been able to confirm any connection to the Texas murders or to last week's bomb threat.
"We've interviewed two suspects, people who have a history with our district court," said Chennault. "They have denied any involvement.
The OSBI is also investigating.