Abigail Williams and Liberty German went missing after going for a hike near some railroad tracks in Delphi, Ind.
Investigators say they discovered DNA evidence at the crime scene where two IN teenagers were found murdered last week.
IN authorities released a short audio clip that they believe is the voice of the person who killed 13-year-old Abby Williams and 14-year-old Libby German. Their bodies were discovered by volunteers who were helping in an organized search for the girls. Though hard to understand, police said the voice is saying, "Down the hill". Of those tips, 1,900 came in after police released an audio recording Wednesday morning of a man saying, "Down the hill". The photo appears to depict a White male wearing blue jeans, a blue coat/jacket, and a hoodie.
The bodies of two missing IN girls found IN the woods near a creek have been identified, and their deaths are being investigated as a double homicide, authorities said February 15, 2017.
The audio quality is not great, but police said it's enough for someone to recognize the person's voice.
Additionally, investigators have released a voice recording from a video found on Liberty German's cell phone, that police believe may be connected to the homicides.
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Indiana State Police on Monday named a man in a photograph as the primary suspect in the double homicide investigation, but nothing is known about him at this time outside of a single image.
Authorities have not released the full video and other evidence from Liberty German's phone yet so they can use them for an eventual prosecution.
"We asked for a fast-track as far as that piece information", said Carroll County Sheriff Tobe Leazenby.
A $41,000 reward is being offered for information leading to an arrest.
There are apparently more clues within the footage, however police are choosing to keep these private at this stage in order to "preserve the integrity of the investigation", says the NY Post.