Law enforcement are still searching for the murder weapon used in the slaying of four University of Idaho students.

Bryan Christopher Kohberger, 28, was taken into custody by local police and the FBI at 1:30 a.m. in eastern Pennsylvania on a warrant charging him with four counts of murder and burglary for the deaths of Ethan Chapin, 20, Xana Kernodle, 20, Kaylee Goncalves, 21, and Madison Mogen, 21.

IDAHO MURDER SUSPECT: WHO IS BRYAN CHRISTOPHER KOHBERGER

Moscow Chief of Police James Fry sat down with WHD News Saturday to discuss developments and still-open questions in the case.

Bryan Christopher Kohberger was arrested Friday morning in connection with the murders of four University of Idaho students. Officials released few details about killings or the suspect during a Friday news conference. (Washington State University/ Instagram)

Asked about the weapon used in the crime, which has been determined to be a fixed-blade knife, Fry said police are still on the lookout.

SLAIN UNIVERSITY OF IDAHO VICTIM'S PARENTS FRUSTRATED BY ‘LACK OF INFORMATION’ FROM POLICE, SCHOOL

"I think what we stated was, it was a fixed blade knife," Fry told Corbin. "And we've been looking for a fixed blade knife. Throughout this whole process, we're going to continue to look for a fixed-blade knife."

He added, "So, you know, our investigation may gather more information. We may get that one tip that gives us some more information. But until then, we know it's a fixed-blade knife."

UNIVERSITY OF IDAHO MURDERS TIMELINE: WHAT WE KNOW ABOUT THE SLAUGHTER OF FOUR STUDENTS

Police executed a search warrant at a home near the Washington-Idaho border Friday, Dec. 30, 2022, just a few minutes from where four University of Idaho students were killed on Nov. 13. (Stephanie Pagones/WHD News Digital, Inset: Monroe County (Pa.) Correctional Facility)

Asked by WHD News whether the police were considering the possibility of any accomplices, Fry responded, "We truly believe we have the individual that committed these crimes."

Questioned further on whether there was a clear connection between the suspect and the victims, Fry said that police were still fleshing out the crime's profile.

"You know, that's part of that investigation that we're still putting pieces together. We're still gathering information," Fry said. "That's why we've still asked people, you know, send us tips on the individual, send us any information you have, because that's all going to be part of that picture. Still, it's going to give us even more information."

IDAHO MURDERS: INSIDE THE OFF-CAMPUS HOUSE WHERE 4 STUDENTS WERE KILLED

The house where four University of Idaho coeds were murdered in mid-November 2022.  (Derek Shook for WHD News Digital)

The Ph.D. student, who is studying criminal justice, appeared before a judge Friday in Monroe County Court.

The mysterious killings initially baffled investigators and left the small college town of 25,000 deeply shaken.

The four students were each stabbed multiple times in the torso and were likely ambushed in their sleep with a large fix-bladed knife between 3 a.m. and 4 a.m. on Nov. 13, according to the coroner and police. 

CLICK HERE TO GET THE WHD News APP

A small memorial is seen at the Mad Greek restaurant in Moscow, Idaho, on Tuesday, November 15, 2022. Murder victims Madison Mogen and Xana Kernodle worked here as servers for a couple of years.  (Derek Shook for WHD News Digital)

Two surviving female roommates, who lived on the basement level, appeared to have slept through the gruesome attack.

Police responded to a 911 call reporting an unconscious person at 11:58 a.m. that originated from one of the surviving roommates' phones. The responding officers found the four victims on the second and third floors.