Four University of Idaho students were found dead at a home off campus on Sunday in what police say was a targeted attack, leaving the town of Moscow reeling as authorities search for a suspect.

The students were identified as Kaylee Goncalves, 21; Madison Mogen, 21; Xana Kernodle, 20; and Ethan Chapin, 20. Based on photos posted on social media, they were close friends, and Chapin and Kernodle were in a relationship.

Moscow police said they responded to a call about an unconscious person at around noon on Sunday. When officers arrived at the scene, they found the four students dead.

Investigators believe that an edged weapon like a knife was used in the killings, although no weapon was found at the scene. Police said in a statement on Tuesday that they believed the attack was isolated and targeted, and there was no imminent threat to the community.

A suspect had not been taken into custody as of Tuesday afternoon.

“Investigators are continuing to work diligently on establishing a timeline of relevant events to re-create the victims’ activities on the evening of November 12 and early morning of November 13,” police said.

Autopsies are expected to be completed later in the week, and police said they hope the results will “provide more definitive information on the exact cause of the deaths.”

Investigators have remained tight-lipped about details of the investigation. However, the Moscow mayor, Art Bettge, told Fox News that they were killed at around 3 or 4 in the morning.

The mayor did not immediately respond to a request for comment. The Moscow Police Department directed BuzzFeed News to its latest news release.

Source: https://www.buzzfeed.com/clarissajanlim/four-friends-university-of-idaho-killed-attack