Autopsies conducted on the four University of Idaho students murdered Sunday confirmed all were killed by stabbing.
Latah County Coroner Cathy Mabbutt believes the act was carried out with a large knife, and the four victims were killed sometime after 1:45 a.m. Sunday.
Mabbutt said it is unknown who was attacked first, and that it is possible some wounds on the bodies were defensive.
DNA samples, including from the clothing, bedding and nail clippings, still need to be tested at a forensics lab.
University of Idaho students Ethan Chapin, Xana Kernodle, Madison Mogen and Kaylee Goncalves were found deceased just before noon Sunday.
The perpetrator remains at large.
Anyone with information on the incident can call the tip line at (208) 883-7180.
