Authorities narrowed their focus to Kohberger after tracing his ownership of a white Hyundai Elantra seen in the area of the killings, according to two law enforcement sources briefed on the investigation. Kohberger's DNA has also been matched to genetic material recovered at the off-campus house where the students were stabbed to death, according to the sources.
Authorities learned the suspect had left the area and went to Pennsylvania, the sources said.
An FBI surveillance team from the Philadelphia field office has been tracking him for four days in the area where he was arrested, according to the sources.
While he was being watched, investigators from the Moscow Police Department, the Idaho State Police homicide bureau, and the FBI worked with prosecutors to develop sufficient probable cause to obtain the warrant. Once the arrest warrant was issued, the Pennsylvania State Police and the FBI made the arrest.