What began as a chat room argument this summer, turned into a felony-level crime, after bomb threats were made against students and staff at a college campus.

This week, Gavin Lee Casdorph, an Anchorage gamer who was 19 at the time, was arrested for "willfully and maliciously making threats and conveying false information concerning an attempt to kill individuals and damage and destroy buildings by means of an explosive."

Casdorph admitted last Tuesday to making the threats, according a sworn affidavit from investigators who interviewed him at his Anchorage home. He was taken into custody on Friday.

Authorities say Casdorph escalated an online spat from a video game, into a full-blown ISIS-related threat that shut down portions of Lafayette College in Easton, Pennsylvania, and forced college leadership to reschedule their graduation ceremony.

According to federal investigators who worked on the case, it all stemmed from a fight which sparked between two players in an online chat room while playing the computer game,

Counter-Strike.

In that altercation, which broke out on the Discord chat platform on May 5, 2018, a user identified as "Person 2" and a user identified by the chat handle "Neuroscientist" got into the fight on Discord.

However, the FBI said it was Casdorph who brought it to a criminal level, by taking to Twitter and making threats.

Twitter user "BdanJafarSaleem" posted several threatening tweets, including a link to a Pastebin letter, in which he claimed to have placed explosive devices around the Lafayette College campus in order to "inflict the utmost damage possible."

According to authorities, the Twitter account BdanJafarSaleem was set up surreptitiously by Casdorph by using a Russian website.

In the letter, "BdanJafarSaleem" indicated he had recently lost his grandfather, that his girlfriend had broken up with him. Officials say the letter also said "that he found faith and healing in Allah and that he pledged allegiance to ISIS" and intended to "inflict damage."

The Twitter threat was also emailed directly to Lafayette College school officials using a Yahoo email account later that same night.

"As a result of these threats," investigators wrote, "Lafayette College took substantial additional steps to guarantee the safety of its students, including moving the location of the college's graduation ceremonies."

Casdorph, who was interviewed at his home in Anchorage on Dec. 11, waived his rights and admitted that he made the threats against Lafayette College.

"[Casdorph] explained that he was in the Discord channel with 'Neuroscientist' on May 5, 2018, the date of the threats, when there was an argument between "Neuroscientist" and Person 2," investigators wrote in the report. "Casdorph said that 'Neuroscientist' asked Casdorph to send in an anonymous threat to Lafayette College."

In order to do this, Casdorph reportedly purchased a telephone number from a Russian website, and then used that number to create a Twitter account using the name of Person 2, to incriminate him in the bomb threat.

The charging documents state that Person 2 was a student at Lafayette College, and the intention was to frame him for the threat.

Casdorph told investigators that he used a private browser host to create the Twitter account and shield his identity, and boasted to investigators that he "believed it would not have been easy for law enforcement to prove how he did it unless he admitted to it."

Investigators narrowed in on Casdorph after interviewing Person 2, who “immediately told the interviewers he could help with the investigation” and that “he knew all about it.”

The FBI tracked the phone number used to verify the Twitter account to a Russian web service that sells numbers to customers seeking to anonymously open social media or email accounts, and then tracked that purchase to Casdorph.