We suspect foul play. They were supposed to meet family members later that evening, but when the teens didn't show up, their relatives called police.
The two bodies were found three quarters of a mile away from the bridge, where the girls were last seen.
The girls were identified on Wednesday, but authorities are not yet releasing the cause or manner of their deaths.
Search parties scowered the area Monday afternoon and Tuesday morning, and the search ended early Tuesday afternoon when the two bodies were found about three-quarters of a mile from where the girls were last seen, police said.
Carroll County Sheriff Tobe Lazenby said they do not believe there is a threat to anyone else in the community.
Authorities appealed for the public's help late on Wednesday to identify a man they were seeking in connection with the double homicide - and who was seen on the same bridge on the day they vanished.
The release of the image comes as authorities have now upgraded the deaths of the two girls, Liberty German and Abigail Williams to that of a double homicide. "We don't know if it's a person who came in and left, or if it's somebody in the neighbourhood", Riley said. They were dropped off by Liberty's sister to do some hiking.
On Wednesday, police confirmed the two bodies they found near Deer Creek Tuesday belonged to the two missing Carroll County teens. You can remain anonymous if you request, ' a police statement read.
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IN authorities released photos of a person of interest Wednesday night in connection to the murder of two teenage girls.
They are also looking for the man in this photo or information on who this man is.
He added: 'I think people need to be cautious and careful.
I know it's had a awful effect on our people and we are grieved this sort of thing would happen here in our community.
The news of the deaths has rattled the 3,000-person community where the two girls were both eighth graders at Delphi Community Middle School.
We have a very good community and they are very strong.
As the investigation continues, Riley asked parents in the community to be vigilant.
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- Coroner ID's Carroll County Bodies As Two Missing Teenage Girls