Police investigating the deaths of four University of Idaho students as they slept in a house near campus are searching for outside surveillance footage in a desperate bid to solve the crime.
The Moscow Police Department has requested CCTV footage from businesses and residences in specific parts of the city any footage recorded between 3am and 6am on November 13, the day of the killings.
Police said they have received about 500 tips after the killings shook the Idaho Panhandle community of 25,000 residents.
The leafy college town about 80 miles south of Spokane, Washington, last saw a homicide about five years ago.
Police said a private driver who gave two of the women a ride home was not involved in the crime.
All four victims were members of fraternities and sororities: seniors Madison Mogen, 21, of Coeur d'Alene, Idaho, and Kaylee Goncalves, 21, of Rathdrum, Idaho; junior Xana Kernodle, 20, of Post Falls, Idaho; and freshman Ethan Chapin, 20, of Mount Vernon, Washington.
The women were roommates, and Chapin was dating Kernodle.
Police said Chapin and Kernodle were at Sigma Chi house on the University of Idaho camps and returned home around 1:45am on November 13.
Police said Mogen and Goncalves were at a bar called The Corner Club in downtown Moscow, left the bar and stopped at a food truck, and then also returned home at about 1:45am.
Police on Saturday said Mogen and Goncalves made multiple calls to a male they didn't identify, and that information is part of an ongoing investigation.
Additionally, police said a person wearing a hooded sweatshirt and seen in a video at the food truck near Mogen and Goncalves shortly before they returned home is not involved in the crime.
Police said two other roommates who were in the house on the night of the killings had returned home at about 1am and slept through the attack, waking later that day.
One of their phones was used to call 911 from inside the residence at 11:58am, police said.
Police have also said those two roommates were not involved in the killings and that the victims were found on the second and third floors of the six-bedroom home.
Evidence leads police to believe the students were targeted, though they haven't given details.
Investigators say nothing appears to have been stolen from the victims or the home and there were no signs of forced entry, with first responders finding a door open when they arrived.
Police also said online reports of the victims being tied and gagged are not accurate.
Authorities have seized the contents of three bins to locate possible evidence, and detectives have asked local businesses if they recently sold a fixed-blade knife.
The Moscow Police Department said four detectives, five support staff and 24 patrol officers are working on the case.
The Federal Bureau of Investigation has 22 investigators helping in Moscow, and 20 more agents assisting from outside the area.
The Idaho State Police has supplied 20 investigators, 15 troopers, and its mobile crime scene team.
