Moscow Police Chief James Fry said in a video statement Friday: \"We have looked at massive amounts of video of footage, especially in the critical camera areas. We've looked at the 24 hours prior to and the 24 hours after ... and now we're extending that out even further to other cameras and other time frames.\"

\"We have massive amounts of people looking at this -- multiple different groups just looking at the different videos at different locations, because we have investigators all across the nation that are reviewing these videos for us and sending us back information,\" the chief said.

The unsolved slayings took place in the early hours of Nov. 13, when roommates Kaylee Goncalves, Madison Mogen and Xana Kernodle, as well as Kernodle's boyfriend, Ethan Chapin, were all stabbed to death in the girls' off-campus house.

No suspects have been identified.

\"PHOTO:
Kaylee Goncalves/Instagram
PHOTO: A photo posted by Kaylee Goncalves a few days before their deaths shows University of Idaho students Ethan Chapin, Xana Kernodle, Madison Mogen and Kaylee Goncalves.
>

\"This person went in very methodical,\" Kaylee Goncalves' mom, Kristi Goncalves, told ABC News on Wednesday. \"I think he really thought it out. I think he was quick, I think it was quiet. And he got in and he got out.\"

Two roommates in the house survived. Police said the roommates are not suspects and likely slept through the murders. They were on the ground floor, while the four victims were on the second and third floors.

\"PHOTO:
Heather Roberts/ABC News
PHOTO: The house where four University if Idaho students were found dead on Nov. 13, 2022.
>

Lanier said Monday that police \"do have a lot of information\" in the case that they're choosing not to release to the public.

\"We're not releasing specific details because we do not want to compromise this investigation,\" he said in a video statement.

Kaylee's dad, Steve Goncalves, urges anyone in Moscow with a surveillance system to come forward. He said he's worried some of those key videos could be erased now that a month has passed.

\"You could save this case,\" he told ABC News.

But, Lanier added, \"We understand that video has a finite life, and sometimes systems will record over itself, and so we started that process very, very early.\"

As students head home for the holidays, the chief promised that officers \"will continue to keep up this pace\" in the investigation.

Police urge anyone with information to upload digital media to fbi.gov/moscowidaho or contact the tip line at tipline@ci.moscow.id.us or 208-883-7180.

ABC News' Nicholas Cirone contributed to this report.

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