For the fourth time this week, a racist threatened to massacre black college students — this time in Michigan

Another person has been arrested for making racist threats against black college students -- this time in Michigan.

Police said they took a suspect into custody Thursday afternoon in connection with an anonymous threat posted on social media directed at students at Michigan Technological University, reported The Detroit News.

The university’s Department of Public Safety and Police Services spotted a message posted about noon Thursday on the Yik Yak social media platform and increased security on the Houghton campus.

The person who made the threat vowed he or she was “going to kill all black people," authorities said.

Police immediately launched an investigation and alerted students of the threat by email.

No information was released about the suspect who was taken into custody several hours later.

The threat is at least the fourth made against black college students this week, after protests over campus racism at the University of Missouri ousted the university president.

Three Missouri men have been arrested and charged with terrorist threats, and authorities are investigating a racist threat made Wednesday against students at the historically black Howard University.

The threats follow two separate strings of suspicious fires earlier this year at mostly black churches in the southeast and then in the St. Louis area, following the shooting deaths of nine black worshipers at a historic black church in South Carolina by a white supremacist and the ongoing Black Lives Matter protests in Ferguson.

Michigan Tech is a research university located in the Upper Peninsula, and only about 1.3 percent of the school's nearly 7,000 students are black, according to Forbes.

“It’s important to remember that we are a community and will not tolerate threats to any member of our family,” said Michigan Tech President Glenn Mroz. “It’s time we watch out for one another.”

Yik Yak, an anonymous, geographically oriented social media network, has grown popular as a message board for college students -- but the company turns over user information without a subpoena, court order or search warrant during investigations of violence or threats.