DELPHI, Ind. — The case of two Indiana teenagers who disappeared on Monday has slowly unraveled over the course of several days.
The situation took a tragic turn when search parties found the bodies of 14-year-old Liberty German and 13-year-old Abigail Williams.
Police said foul play is believed to be a factor in their deaths.
Few details have been released, and many questions remain about what happened to the teens and who is responsible for the killings.
PHOTOS: Investigation into teens' deaths
But here's what we know so far:
1. When they went missing
German and Williams were last seen 1 p.m. Monday by a family member dropping them off at a trail near Monon High Bridge, an abandoned railroad bridge that spans Deer Creek.
The girls reportedly agreed to meet a family member later, but never showed up. They were reported missing about 5:30 p.m.
Police and search parties scoured the base of the bridge and surrounding trails for hours before calling the search off due to darkness.
In a news release just after midnight, Carroll County Sheriff Tobe Leazenby said there was no reason to believe the girls were in danger and he did not suspect foul play.
2. When they were found
The search resumed the next morning as police and volunteers retraced their steps and scanned for clues they would have missed the night before.
Just after noon, two bodies were reportedly found roughly a half-mile upstream from the bridge.
In a subsequent news conference, authorities said the bodies had yet to be positively identified and could not confirm if they were German and Williams.
Police noted, however, that foul play likely was a factor in the deaths.
3. When they were identified
An autopsy on the bodies began at 8 a.m. Wednesday in Terre Haute.
Indiana State Police Sgt. Kim Riley said that morning that Delphi's tight-knit community had offered hundreds of tips related to the investigation.
During a news conference later that day, police confirmed the identities of the bodies were those of German and Williams.
"This is considered a double homicide investigation, and no further information will be released at this time," Riley said Wednesday.
4. A person of interest
Just before 7 p.m. Wednesday, ISP released a photo of a subject reportedly walking on Dephi's historic trail system at the time of the girls' disappearance.
The subject appears to be wearing a dark blue jacket and light blue denim jeans with his or her face obscured by a hat and scarf.
Riley said in a news release that police are seeking the public's help in identifying the person so he or she can be questioned.
Additionally, police are asking anyone parked near High Bridge Trail from 1 p.m. to 5 p.m. to call the Carroll County Sheriff’s Office or the Delphi Police Department at 765-564-2345.
Indiana State Police also can be contacted at 765-567-2125.
Information can be reported anonymously at the caller's request.