Investigators were seen inside the Moscow, Idaho home on Thursday where four University of Idaho students were killed earlier in the week.
The four students, Ethan Chapin, 20; Xana Kernodle, 20; Madison Mogen, 21; and Kaylee Goncalves, 21, were killed on early Sunday morning between the hours of 3 and 4:00 a.m. inside a King Street home, according to Moscow Mayor Art Bettge.
Moscow Police Department officers were responding to an unconscious person call on Sunday at 11:58 a.m. when they discovered the four students, who were pronounced dead on the scene.
In a Tuesday press release, police said that the suspect used an "edged weapon such as a knife" in the attack. Investigators believe the incident was "an isolated, targeted attack" with "no imminent threat to the community at large."
IDAHO MURDERS: STUDENT SAYS 'THERE NEEDS TO BE JUSTICE' FOR PERSON WHO KILLED FOUR STUDENTS
Investigators with the Idaho State Police were seen at the house on Thursday through the day, taking pictures and collecting evidence. One person could be seen in a hazmat suit while inside the house.
A spokesperson for the Federal Bureau of Investigations told Fox News Digital on Thursday that its Behavioral Analysis Unit is assisting local law enforcement officials in the case.
The unit performs "crime analysis, profiles of unknown offenders, investigative suggestions, threat assessments, interview strategies," and "critical incident analysis."
ELITE FBI UNIT JOINS PROBE INTO UNIVERSITY OF IDAHO MURDERS, STUDENTS REMEMBERED
Latah County Coroner Cathy Mabbutt revealed in an autopsy report on Thursday that the students were pronounced dead at noon on Sunday, with the manner of death being a stabbing.
During a Wednesday press conference, Moscow Police Department Chief James Fry said that he can't say that there isn't a threat to the overall community.
"We do not have a suspect at this time, and we cannot say there is no threat to the community," Fry said. "There is a threat out there, possibly."
"We need to be vigilant. We need to watch out for our neighbors," Fry said.
IDAHO STUDENT KILLINGS: CORONER RELEASES AUTOPSY FINDINGS
He added that two roommates were inside the house when the incident happened and said they were "unhurt."
An Idaho State Police spokesperson told Fox News Digital that the two roommates are cooperating with the investigation.
Latah County Prosecutor Bill Thompson told NBC News on Thursday that it's possible there's more than one suspect.
UNIVERSITY OF IDAHO MURDERS: TWO ROOMMATES WERE AT HOME WHEN FOUR STUDENTS WERE KILLED
"It certainly is possible. That's the purpose of the investigation, that's why we're really hoping for any information from the public that can help the investigators recreate everyone's activities from Saturday night into early Sunday morning and hopefully give them the leads, the information, to identify who did this," Thompson said.
Shortly before being killed, Mogen and Goncalves were both seen at a local food truck in Moscow, Idaho, through a Twitch stream before returning to their residence,
Anyone with information about the incident is being asked to call Moscow police at 208-883-7054.
Fox News' Rebecca Rosenberg and Audrey Conklin contributed to this report.
