(Las Vegas, NV)  –  A pair of civil rights groups have criticized the Justice Department for delaying an investigation into deadly shootings by Las Vegas police.  Officials with the ACLU and the NAACP have called on U.S. Attorney Daniel Bogden to get involved, but Bogden urged the groups to give the process a chance.  Justice officials say they would wait for an internal review of Metro Police policies before launching an investigation.  There were 12 fatal officer-involved shootings in Las Vegas last year.