The investigation into the murders of four University of Idaho students is entering a critical stage in its third week.
Authorities have said they have not ruled out that more than one person may have been involved in the killings. Police believe the attack was targeted.
"Police having no suspects is factually incorrect," Miller said. "Police have had a number of suspects they've looked at, but they have no suspect they're willing to name. You don't name them unless you have a purpose for that. That's not unusual." Lastly, the FBI has 56 field offices in major cities throughout the country, which can expand the reach and capability of the investigation.
Chances are "pretty high" a suspect could have cut themselves during the attack, so police are looking carefully at blood evidence, says Joe Giacalone, adjunct professor at John Jay College of Criminal Justice and retired NYPD sergeant who directed the agency's Homicide School and Cold Case Squad. Investigators will learn every detail about the four victims, their relationships with each other and the various people in their lives, Miller says. This includes cell phone records and internet records, he says, as well as video surveillance from every camera surrounding the crime scene.
In an effort to locate the weapon -- believed to be a fixed-blade knife -- detectives contacted local businesses to see if a similar knife had been purchased recently. Miller said it's "not fair" to investigators for the public or media to criticize them for not releasing enough information about the case.
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