A letter from someone claiming to be the 'Chinese Zodiac Killer' has been sent to numerous TV stations in New York.
Several television stations in Albany received the letters and alerted the authorities on Wednesday (8 December).
The FBI told the recipients to not open any future letters in an attempt to preserve any forensic evidence that may be present, The Times Union reports.
The contents of the letters have not been revealed to the public.
The original Zodiac Killer murdered at least five people in San Francisco in the 1960s.
The killer, who has never been identified by the FBI, sent letters to media outlets with threats of violence if they were not published.
Back in 1973, someone claiming to be the killer wrote a letter to The Times Union, vowing to ‘start killing again’.
The letter read in part: “You were wrong I am not dead or in the hospital I am alive and well and I’m going to start killing again. Below is the name and location of my next victim but you had better hurry because I’m going to kill her August 10th at 5pm when the shifts change. Albany is a nice town.”
Although the killer has never formally identified, a group of detectives, journalists and military intelligence officers claimed to have cracked the case back in October.
According to the 40-strong team called the 'Case Breakers', Gary Francis Poste was the man responsible. Poste died in 2018.
Jen Bucholtz, a former Army counterintelligence agent who works on cold cases, told Fox News that other clues that led to Poste were found in the killer's notes.
They removed the letters in Poste's full name, revealing a different message.
She said: "So you've got to know Gary's full name in order to decipher these anagrams.
"I just don't think there's any other way anybody would have figured it out."
They also believe Poste was responsible for the murder of Cheri Jo Bates on 31 October 1966, in Riverside, California, hundreds of miles away from the location of the Zodiac's first known killing two years earlier.
The 18-year-old was found dead in an alleyway on the campus of Riverside City College.
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