CLINTON, SC (FOX Carolina) -
Officers in Laurens County said they are continuing to investigate threats made against local schools and police.
Clinton Public Safety Chief Robin Morse said they have interviewed people and tracked down available leads after threatening letters were sent to Laurens County School Districts 55 and 56, Presbyterian College and their own department last Thursday.
Investigators said the letters were typed but sent in handwritten envelopes - and that handwriting could help track down whoever wrote the threats.
"We've been working anywhere between 12, 14, 16 hour days," Morse said.
While not much about the investigation has been released, a handwriting analysis expert said the handwritten envelope could be a big help in the investigation and is a common mistake for anonymous writers
"The place of the letters on the envelope, the spacing, do they put a period after the S and after the C. A lot of people still do that and it can be very identifying," Theresa Dean, forensic handwriting expert told FOX Carolina.
Dean mostly works in the private sector in western North Carolina but she has used her expertise on threats like the ones in Laurens County. She said even people who try to disguise their writing usually do not do a good job.
She said the more a person writes, the more he or she reveals about themselves.
Investigators said they do not want to reveal much about the letters, but they said they are treating the threat as serious. And they said the county's children are safe.
"We have taken all the steps we can take to make it as safe as possible," Morse said. "I feel confident enough that I send my own son to school and I don't worry about it."
Clinton police are still looking for tips about the threats.
If anyone has information, they are asked to call the 24-hour tip line at 864-200-4565.
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