The Oklahoma man accused of posting vague but violent online threats against the city of Casper has been indicted by a federal grand jury.

Officials say Glenn Allen Kirkham is responsible for authoring the Jan. 14 post, which prompted several Natrona County schools to go on lockdown until the threat was deemed a hoax.

In a profanity-laced message posted on 4chan.org, an online message board site, the author threatened to employ nontraditional weapons such as kitchen knives, an aluminum baseball bat, and a hammer and wooden stake — in addition to handguns — to prove that a “high score” could be achieved without assault rifles.

The only reference to Casper was in the opening statement: “Watch the news in about 1-2 hours. Casper, Wyoming.” It did not specify a specific target or location.

Casper police were alerted to the threat by telephone calls from online readers from around the country the morning the threat was posted.

The post’s message seemed to indicate that the author considered himself a sort of political martyr for gun rights.

“I will be victorious, I make it clear that intricate planning and poor weapons will trump amateurs with AK’s any day of the week,” it read, referring to the AK-47 assault rifle.

The writer also alleged that the shooter in the Dec. 14 Newtown, Conn., school massacre — whom the post referred to as “that kid in CT,” — used only handguns, rather than the reported shotguns and assault rifles.

“I give my life for your freedom today,” the post read in closing. “I love you, /b/rothers.”

The post’s accompanying photo appeared to be a dirty bathtub full of brains.

Upon questioning, Kirkham reportedly called the post a “work of artistic falsehood” and quoted a disclaimer on the site that states anyone would be a “fool” to believe any posting.

According to documents from the United States District Court of the Western District of Oklahoma, Kirkham has been officially charged with transmitting a threat by interstate communications. The offense could carry a sentence of up to five years, a $250,000 fine or both.

Kirkham is free on a $5,000 unsecured bond.

His initial appearance will be set within the next 10 days.

Reach crime reporter Megan Cassidy at 307-266-0534 or megan.cassidy@trib.com. Follow her on Twitter @meganrcassidy.

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