When officers arrived at 1122 King Road in Moscow on the afternoon of November 13, they saw a macabre scene.
The brutal murders have rocked the campus of the University of Idaho, where all four victims attended — and the town of Moscow is reeling from its first murder in several years.
Want to keep up with the latest crime coverage? Sign up forPEOPLE’s free True Crime newsletterfor breaking crime news, ongoing trial coverage and details of intriguing unsolved cases.
Angela Palermo/Idaho Statesman via ZUMA Press

“We had officers breaking down at the scene,” a law enforcement source who is familiar with the case tells PEOPLE in its latest issue. “It wasn’t a clean crime scene. There was cross contamination between the rooms. This wasn’t a professional job — this was something more haphazard.”
As authorities began the meticulous and arduous task of collecting evidence, they eventually began to zero in on asuspect: Bryan Kohberger, 28, a Ph.D student at the Washington State University Department of Criminal Justice and Criminology. The university is just eight miles from the crime scene.

For more on how police made an arrest weeks after four University of Idaho students,subscribe now to PEOPLE, or pick up this week’s issue, on newsstands Friday.
“We’re operating on the assumption that at least one of the victims knew the person or persons responsible,” says the police source. “But nothing is really off the table. We don’t want to rule anything out until we know for sure.”
His lawyer did not respond to PEOPLE’s request for comment.
source: people.com