There is not enough information in your post to answer definitively.
What does "warned" mean? What kind of evidence related to their mental state? How does mental state relate to the threat?
If the officer was given specific, credible and actionable information about an imminent threat and/or a crime (illegal weapons possession, etc) and did nothing, then yes, there could be civil and criminal culpability. But, it would have to be very specific, and very credible, and the officer would have had to failed to act. I'm assuming this involves a mental health situation instead of just a crime. MH issues, minus a crime, are complicated and not strictly a police matter.
In Colorado, there is a "red flag law" (Extreme Risk Protection Order) in which a judge my issue an order that commands individuals to surrender firearms; police may seize the firearms but that requires a search warrant in addition to the ERPO.
https://leg.colorado.gov/bills/hb19-1177
(22 year LEO in Colorado, current police sergeant; former homicide detective, in addition to numerous other assignments)
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