Authorities investigating the slayings of two girls in Indiana have received more than 1,900 recommendations considering the fact that producing an impassioned plea on Wednesday for people today to come forward with data, a law enforcement supply close to the investigation told ABC News now.

The surge in ideas followed the release of a new video clip retrieved from the cellphone of a single of the victims, 14-year-old Liberty “Libby” German. When police played some audio from the clip at a news conference in the town of Delphi on Wednesday morning, reporters heard just three words from a deep voice: “Down the hill.”

The audio excellent is not great, but police stated it is enough for a person to recognize the individual’s voice. Investigators believe the clip was recorded just prior to the attack.

“Libby had the presence of mind to turn on her video deneme bonusu camera,” Indiana State Police spokesman Capt. David Bursten stated Wednesday. “There is no doubt in our minds that that young lady is a hero.”

The rest of the video will not be released at this time since of the ongoing investigation. Investigators recovered other evidence from the girl’s phone that is also not getting released, Bursten mentioned.

German and 13-year-old Abigail “Abby” Williams, both of Carroll County, were reported missing by their families Feb. 13 following the two did not return from a hike.

Immediately after organized searches, the bodies of the two girls had been located Feb. 14 outside Delphi in the woods close to Deer Creek, about 3-quarters of a mile from an abandoned railroad bridge where they have been dropped off the day ahead of to go hiking. An autopsy revealed their identities.

“Proof in this case has led investigators to think that this is a double homicide, and that is what we’re investigating at this time,” Indiana State Police spokesman Sgt. Tony Slocum told reporters Wednesday.

Indiana State Police on Monday said a man in a photograph is Betpas the key suspect in the investigation. The man — dressed in blue jeans, a blue jacket and a hoodie — was photographed on a nature trial around the exact same time the two girls disappeared.

He was previously labeled a particular person of interest, and police had mentioned he might be only a witness to the crime.

“We are actively seeking for this particular person. We believe this person is our suspect,” Slocum said.

Authorities spent a lot of Wednesday’s news conference delivering an emotional appeal to the public to submit ideas to track down the man in the photograph and the particular person whose voice is in the audio clip.

“A person knows who this person is,” Indiana State Police Superintendent Douglas Carter told reporters, while holding back tears. “And if you are watching, we’ll discover you.”

Investigators said that there is the possibility of additional than a single suspect and that it is unclear irrespective of whether the voice in the audio clip belongs to the man in the photograph.

The FBI has been assisting nearby authorities in the investigation since last week. Agents have briefed FBI Director James Comey on the case on two occasions.

Gregory Massa, the FBI assistant specific agent in charge in Indianapolis, asked the public to believe back to Feb. 13, the day the girls went missing.

“Just think if you had an interaction with an individual who inexplicably canceled an appointment that you had collectively,” Massa mentioned Wednesday. “Or an person named into function sick and canceled a social engagement. At the time, they gave what would have been a plausible explanation.”

Suspicious behavior or a modify in someone’s behavior must also be a red flag, Massa mentioned.

“Did [an] person travel unexpectedly?” he asked. “Did they adjust their appearance? Did they shave their beard, cut their hair or adjust the color of their hair? Did they change the way they dress?”

In total, authorities have received approximately three,900 ideas by way of telephone and e mail. Authorities and community leaders are providing a $50,000 reward for any info leading to an arrest, according to a press release from the Indiana State Police on Thursday.

Citizens can supply info about this case by calling the Delphi murder tip line at 844-459-5786. Details can be reported anonymously. Ideas can also be emailed to abbyandlibbytip@cacoshrf.com.

ABC News’ Michael Edison Hayden and Avianne Tan contributed to this report.

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