Residents of a small college community in Idaho have been warned to remain on high alert as authorities continue their investigation into how four students ended up being stabbed to death in a house and a door was left wide open. The killer is still on the loose.

“We do not have a suspect at this time, and that individual is still out there,” Moscow Police Chief James Fry said Wednesday.

According to data provided by the state police, the city with a population of 25,000 hasn’t reported a homicide since 2015. Local police, the FBI, and state police are currently on the hunt for a suspect in the city, but they haven’t found the murder weapon or the motive.

“We cannot say there’s no threat to the community,” Fry said at a news conference. “And as we have stated, please stay vigilant, report any suspicious activity and be aware of your surroundings at all times.”

The police had indicated in the past that there was no danger to the neighborhood.

Kaylee Goncalves, Madison Mogen, Xana Kernodle, and Ethan Chapin were the students at the University of Idaho and were discovered dead on Sunday afternoon in a crime scene. The news of their deaths shattered the community’s sense of safety near the Washington state border.

“We’re reviewing video that has been collected, but we’re asking citizens to contact us with any information you may have that will help in this investigation,” Fry said. He acknowledged that the crime has “affected all of us, the families, the University of Idaho, our community, our country and our officers.”

According to the statement made by the President of the University of Idaho, Scott Green, classes at the university have started back up again after being canceled the previous Monday.

“A number of our students still want to go to class,” he said Wednesday. “They gain comfort being around other students. They gain comfort from interacting and staying busy with their faculty, and attending classes, labs, some are working on their semester projects, so we’ve heard from them.”

According to Green, the school is “encouraging students and employees to take care of themselves” as they head towards the Thanksgiving break.

The school has “continually pushed for as much information as possible, knowing we cannot interfere with the important work of a good investigation,” Green said in a statement on Wednesday.

“We just want justice for these victims,” he said.