That's from a website, War on the Horizon, that you can see here. The website is run by an Irritated Genie, who may or may not be Ayo Kimathi, an employee of the Department of Homeland Security.
The Southern Poverty Law Center has an unnamed source for the story, a former supervisor of Kimathi at DHS who discovered his website in June.
A former supervisor of Kimathi’s at the DHS told Hatewatch, “Everybody in the office is afraid of him.”
“This guy is filled with hate,” the supervisor continued. “People are afraid he will come in with a gun someday and go postal. I am astounded he’s employed by the federal government, let alone Homeland Security.”