Missing Colorado Girl: Can Disappearance Be Linked to Others?

Jessica Ridgeway, 10, was last seen while walking to school.
3:00 | 10/09/12

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Transcript for Missing Colorado Girl: Can Disappearance Be Linked to Others?
A serious story we're turning to. The latest on the search for that missing 10-year-old in colorado. Seen here in home video, obtained by abc news. Jessica ridgeway vanished walking to school on friday. And police are investigating whether her disappearance could be linked to other cases. Abc's clayton sandell has the latest. Reporter: In new video obtained exclusively overnight by abc news, 10-year-old jessica ridgeway, horses around with a video camera and the family dog. Hat's the camera. Reporter: Take another look. may. That's the camera. Reporter: This morning, the state crime lab is processing jessica's backpack for dna evidence. It was found sunday with her water bottle, six miles from where she was last seen. Police say it's vital evidence, the only trace of her since she vanished friday. The bottom line to give us idea and evidence of who may have been in contact with it. And where we can focus a search. Reporter: That search expanded monday. More than 100 people combing roadsides and rocky terrain. Meantime, police are checking reports that three weeks ago, in a nearby town, a suspicious man was seen approaching children. It's a piece. But this time, we have nothing to say we believe it's related to the disappearance of jessica. Reporter: Appearing grief-stricken, jessica's mother walked outside of her home monday. She was asleep on friday when the school called her to report her absent. She did not get the message for eight hours. Only then did she call police. Fbi agents and police are still urgently going door-to-door. They even asked william kessel to search a locked room to make sure jessica wasn't inside. She wasn't. They have to rule that room out. Reporter: We're now going into the fifth day since jessica failed to show up here at school. And in that exclusive video, investigators and her family want you to see her face and hear her voice, hoping that someone will provide this case the break that it needs. We also expect to hear from jessica's family for the first time later today.

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

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