Kean University is investigating threats of violence against African-Americans on its campus that appeared on social media while students were protesting racial inequality, the school said on Wednesday.

An anonymous user posted messages to Twitter on Tuesday night, threatening to kill or shoot black students and others at the New Jersey school, where students have been demonstrating to raise awareness about racism on U.S. campuses.

"I will shoot every black woman and male I see at Kean University," wrote the Twitter user using the handle @keanuagainstblk. The account has since been suspended.

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Kean University police said they alerted federal, state and local law enforcement and were providing extra security. The school in Union, about 10 miles southwest of Newark, remained open on Wednesday.

"We are profoundly troubled by this display of hatred which does not reflect in any way the values we hold sacred on our diverse campus," Kean University police said in a statement.

Kean, a public university with 13,000 undergraduates, said in a statement that was posted on its website that the school was open and operating on a regular schedule.

The university is one of many where students have staged demonstrations and walkouts in sympathy with students at the University of Missouri, where the school president resigned in the wake of protests over his handling of on-campus racial issues.

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Since protests began to proliferate university campuses last week, police have made several arrests of men charged with posting messages on social media threatening to kill black students.

Last week, three 19-year-old men were charged with making threats on social media about shooting people at college campuses in Missouri, and two of them talked about targeting black people.

Also last week, a 21-year-old man was charged with making threats against black students at Michigan Technological University.