Man allegedly makes racist threats of mass violence against Howard U students. Now the FBI has him.

John Edgar Rust was arrested Wednesday for allegedly threatening mass violence against black students at Howard University.

'It's not murder if they're black'

Rust began his threats on forum website 4chan, according to the FBI.

The agency was tipped off by a Washington, D.C., resident in 2015, according to a probable cause affidavit.

Rust reportedly wrote, "We might as well just bend over and let the n*****s f**k us right in the a**."

He allegedly continued later in the day and this time threatened violence.

"Any n*****s left at Howard University after 10 tomorrow will be the first to go," Rust reportedly wrote. "And any of those cheapskate n*****s who try to get out using the metro will regret that choice real fast. Sure, the po po will take me down, but I’ll go out a hero knowing I made the world better."

The message added, "After all, it’s not murder if they’re black."

According to the Justice Department report, investigators were able to locate the source of the threats via a Wi-Fi network search.

Investigators were led to a Panera Bread in Alexandria, Virginia, where they were able to associate Rust — and his credit card — to having made the threats while online in the restaurant.

The report alleged that after an examination of Rust's personal belongings — his computer, an old cellphone, and hard drive — investigators felt confident that Rust himself made the threats.

Other items of note reportedly found on Rust's digital belongings included information on firearms, explosives, and hand-to-hand combat.

According to reports, Rust is a registered sex offender who was convicted in 2012 for indecent liberties with a child and aggravated sexual battery. One of the stipulations of his probation included being prohibited from using the internet.

Rust, 24, has been charged with transmission of communications containing threats to injure another person. He is scheduled for a preliminary hearing today in federal court.