College Killer’s Internet Warning: ‘Don’t Go To School Tomorrow’

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Psycho killer Christopher Harper Mercer — who savagely slaughtered nine students and injured many others before being cut down in a hail of police gunfire — dreamed of dancing with the devil!

“I’ll be welcomed in hell … and embraced by the Devil!” — those were the chilling words from a sick, rambling note the Umpqua Community College killer gave to a random person at the school before he began a murderous rampage in tiny Roseburg, Ore.

Mercer’s death-wish memo also contained rants about his hatred of black men and his sexual frustration.

The demented killer, who was armed to the teeth for the attack with an assault rifle and five pistols, including a 9mm Glock, was described by authorities as a “hate-filled” individual with anti-religion, anti-government and white supremacy leanings.

A trail of horrifying posts and insane manifestos confirms that portrait.

“I have an elaborate plan … Needless to say; it shall be glorious,” read a twisted Internet post on the message board 4Chan addressed to “fellow robots” that authorities believe was posted anonymously by Mercer.

The post also wished readers “an enjoyable Elliot Rodger day” — a reference to the man who killed six people near the Santa Barbara University campus last year.

“Personally, I will mark this day’s celebration of our Hero’s deeds.” He concluded with an ominous warning: “Don’t go to school tomorrow if you are in the northwest” in the early morning hours of Oct. 1.

The first shots were fired at UCC at 10:38 a.m. Mercer advised that a “‘happening thread will be posted tomorrow morning. So long space robots … Won’t say more to [sic] much to prepare.’ ”

The FBI has been poring over another website that Mercer operated. In an Aug. 31 post, the killer wrote a sickening tribute to fellow murderer Vester Flanagan, who gunned down a Virginia TV reporter and cameraman on live television in August.

He wrote: “A man named Vester Flanagan opened fire on two former colleagues on live TV. He also recorded his own footage of the event. While reading about the event, I read some excerpts of his manifesto the media was releasing. And I have to say, anyone who knew him could have seen this coming. People like him have nothing left to live for and the only thing left to do is lash out at a society that has abandoned them.”

Mercer went on, sounding star-struck with the infamy that murderers attract.

“On an interesting note, I have noticed that so many people like him are all alone and unknown, yet when they spill a little blood, the whole world knows who they are. A man who was known by no one is now known by everyone.

“His face splashed across every screen, his name across the lips of every person on the planet, all in the course of one day.

“Seems the more people you kill, the more you’re in the limelight.”

Just three days earlier on that same profile, Mercer uploaded “This World: Surviving Sandy Hook,” a documentary about the massacre of 20 children in Newtown, Conn.

The killer, whose father is British, also idolized the IRA and Nazis. His e-mail handle, IronCross45, is a reference to a Nazi war medal, and the sicko used the same term as his dating profile name. He wrote glowing reviews of Nazi memorabilia he had bought online and his MySpace page featured images glorifying masked IRA fighters, praising them as “looking cool.”

Mercer’s dating profile indicated he was a “conservative Republican.”