Surveillance video and a computer seized from this library reading room were used in the RNC investigation. (CBC)

A Memorial University student has been charged with uttering threats, after a death threat was posted on the internet this week against a St. John's professor, police said Friday.

The Royal Newfoundland Constabulary said the woman, 18, has also been charged with uttering threats against a different professor in an earlier incident.

The threat was posted on a page on Wikipedia, the open-source encyclopedia that allows any user to become an editor, the RNC said.

"Through the course of this investigation, we learned of a second, very similar threat, that was posted on an internet site, actually the same internet site," Const. Paul Davis said Friday.

The earlier threat was posted Oct. 1, Davis said.

The woman will appear in provincial court in St. John's on Dec. 4.

The RNC took an unnamed professor into protective custody on Monday, after a United Kingdom resident informed the force that a death threat had been posted on the internet. Details of the threat have not been disclosed.

The RNC seized a computer from a large reading and research area at Queen Elizabeth II Library.

Video surveillance from the room was also used in the investigation.

Ross Klein, president of the Memorial University Faculty Association, said earlier this week that the police made the right move by acting swiftly.