BARDSTOWN, Ky. (WHAS11) --- Bardstown Police are on heightened alert after someone made serious threats against them.
It launched a full scale investigation by the FBI.
"They may think it's a joke but I don't. I'm taking it seriously," Bardstown Police Chief, Rick McCubbin, said.
Chief Rick McCubbin confirms he received one threatening letter and phone call last Thursday and Friday.
McCubbin said the letters are threatening to hurt other officers.
"That's the gist of it, that's not the exact wording that more of that was to come," McCubbin said.
Bardstown residents had the following to say.
"These threatening letters to the Bardstown Police Department, these children or adults need to be disciplined," a Bardstown resident said.
"My feeling is that it's really a shame. I hate it," Bardstown resident, Linda Calbert, said.
The letter was turned over to Kentucky State Police and the FBI. All of this is on the heels of Officer Jason Ellis' murder on May 25. He removed tree limbs off Bluegrass Parkway in Nelson County. He was ambushed and shot to death. Chief McCubbin says Ellis was the department's only K-9 officer, having arrested many drug dealers and users.
Now every officer must travel in pairs for backup.
As the hunt for Ellis' killer continues, so does the investigation into the threatening letter.
McCubbin said, "If they're identified we certainly will push for legal avenues it will take to prosecute them. They may think it's a joke but I don't."
Kentucky State Police say they receive dozens of tips every week about Ellis' murder.
As for the threats--Chief McCubbin doubts it was teenage prankster.
WHAS11's Gene Kang has more, just click on the video player above.