$50K reward to help solve the murders of two teen girls who went missing on a hike in Indiana

Police using clues found on teen's cellphone to solve murders of Libby German and Abby Williams.
1:33 | 02/24/17

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Transcript for $50K reward to help solve the murders of two teen girls who went missing on a hike in Indiana
Indiana tonight the reward is growing in the hunt for the killer of two teenage girls investigators asking everyone in the region to care for Lee listen to the sound they've now released. Please have given out this photo and an audio recording of the suspect it's believed one of the girl's recorded it before they were killed. ABC's Alex pres tonight with the hundreds of tips already coming in in Indiana. Tonight Indiana investigators inundated more than 19100 tips coming in since police released this short audio recording. Yeah. Yeah yeah. That voice authorities believe is Abby Williams and Libby Germans killer. The recording captured only b.'s phone you think my Gaza sounds like fill in the blank. Call us. Make an anonymous tip to two young friends were murdered after they set out for a hike last week in the small town of Delphi. Authorities believe the girls walked through this nature trail and we know about an hour after they started their hike they ended up right here on this railroad bridge. Libby snap chatting this picture of abbey on those tracks police even getting this image of the suspect from her phone. Sensing danger authorities say she hit record. Yeah. Yeah. The fourteen year old's efforts to record her alleged killer family friends say just another sign of her courage she would do any thing you know and to protect yourself for anybody or you know. She's pretty. Quick not thinking about things like that. Then David there's now a 50000 dollar reward for any information leading to an arrest David Alex Perez thing.

This transcript has been automatically generated and may not be 100% accurate.

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