From the Las Vegas Review-Journal:
‘Credible’ Islamic State propaganda video features short clip of Las Vegas Strip
A legitimate Islamic State group propaganda video posted on social media last week features brief footage of the Las Vegas Strip while calling for lone-wolf terrorist attacks, and Las Vegas police are treating it as a credible threat.
Looks like Obama's immegration policies are bearing fruit.

Being that this investigation involves a sitting mayor an outside PROSECUTOR AND LAW ENFORCEMENT ENTITY should be involved here.