Police release last-known images of missing Utah student

The newly released pictures were taken just after Mackenzie Lueck, 23, landed at Salt Lake City Airport, just before she vanished.
1:38 | 06/26/19

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Transcript for Police release last-known images of missing Utah student
Michael, now to new developments involving that missing college student in Utah. Police are releasing the last known images of Mackenzie Lueck seen in the airport before she vanished. ABC's Clayton Sandell is in salt Lake City with the latest on that. Good morning, Clayton. Reporter: Good morning, Amy. Police say those images were taken less than an hour before she got a ride from the airport to this park meeting someone here at 3:00 A.M. Then disappearing. Now, the FBI has joined the search. This morning, the last time Mackenzie Lueck was seen in public these newly released pictures taken just after she landed at the Salt Lake City airport nine days ago just before she vanished. She did not appear to talk to anyone in the airport. Reporter: The 23-year-old university of Utah senior then took a ride share to this north Salt Lake City park, the ride share driver now cleared as a suspect told police Lueck met someone there at 3:00 A.M. The description we have is vague. It could have been a male or a female. Reporter: She hasn't been seen since and investigators say there's no evidence of foul play but with few leads and no contact her friends and family are growing concerned. It's just getting more and more real and I feel she is in danger at this point. Reporter: Police say they're getting search warrants looking online for clues. Does Mackenzie have an alternate phone she has used in the past or is using? Does she have social media accounts that we don't know about? Reporter: Police say they've gotten more than 125 tips but they're now looking for the one that will help break this case. Guys. Wow. Sad case indeed. Hopefully they find her safely.

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

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