9:46 AM PT -- We just received contrary information about the police investigation from a source high up in the Metro PD. Our source says this is indeed a criminal investigation and they are taking the incident "as serious as a heart attack." The source adds the case will "likely" be referred to the D.A., although that does not mean criminal charges will be filed.
9:10 AM PT -- We're told Vegas police brass will be meeting face-to-face with Britney Spears this morning to discuss the incident.