A person of interest was arrested in connection to the murders of four University of Idaho students (Picture: AP)

Authorities have arrested a person in connection with the stabbing deaths of four students at the University of Idaho.

Law enforcement sources confirmed to NBC News that a person of interest in the confounding cold case was arrested over 2,500 miles away in Monroe County, Pennsylvania.

The person of interest was described as a 25-year-old man. He was taken into custody by local police officers and FBI agents.

The suspect appeared before a Monroe County judge at 8.30am on Friday morning, the sources said.

Moscow Police Department announced that they would hold a press conference about the arrest at 1pm Mountain Time. The press conference will be livestreamed on YouTube.

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The suspect appeared before a Monroe County judge at 8.30am on Friday morning, the sources said.