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CHICAGO (AP) — The University of Chicago may have felt it had no choice but to take the extreme step of closing for an entire day after an online threat against whites on campus that authorities say was motived by the police shooting of a black teenager, security experts said.

The city was on tenterhooks after last week’s release of video of Officer Jason Van Dyke fatally shooting 17-year-old Laquan McDonald 16 times. Protests that followed, as well as heightened awareness about campus shootings elsewhere and the recent attacks in Paris, may have forced the university’s hand, said one expert. It canceled classes and activities Monday but was expected to reopen Tuesday.

“I think the university erred on the side of caution after putting the whole picture together,” said Michael Fagel, who teaches national security and emergency management at several schools, including the Illinois Institute of Technology. “They had to think: If we don’t react appropriately and something happens, there’ll be an outcry.”

Jabari R. Dean, 21, of Chicago, was arrested Monday on a federal charge of transmitting a threat in interstate commerce. According to a criminal complaint, Dean, who is black, posted the threat online Saturday, days after prosecutors charged Van Dyke with first-degree murder and after the city released video of the shooting.

Dean, an electrical engineering student at the University of Illinois at Chicago, wrote that he would “execute approximately … 16 white male students and or staff, which is the same number of time (sic) McDonald was killed” and “will die killing any number of white policemen that I can in the process,” the complaint says.

The University of Chicago cited “recent tragic events” at other campuses nationwide in explaining its decision to close. On Oct. 1 at Umpqua Community College in Roseburg, Oregon, a gunman opened fire and killed nine people. Other shootings have happened in Arizona and Tennessee.

The FBI was tipped about the Chicago threat Sunday, according to a criminal complaint. After the FBI traced it to Dean, he admitted to agents that he had posted it online and said he took it down shortly afterward, the complaint says. Despite the threat mentioning three guns, a prosecutor said Dean did not appear to pose a threat.

Graduate student Marlene Saint Martin, of Mexico, said she heard about the threat through a flurry of phone messages Sunday night, then saw an email from campus officials announcing classes were canceled.

“I felt that at least the university was taking all the precautions to keep us … safe,” she said.

The university’s move affected more than 30,000 people, though the University of Chicago Medical Center was open to patients.

The online threat allegedly read: “This is not a joke. I am to do my part and rid the world of white devils.” Phillip Rutherford, Dean’s uncle, told reporters that his nephew was never serious about an attack and had done something “silly” and “stupid” because he’d had too much time on his hands.

“He’s run out of things to do,” Rutherford said.

A bond hearing for Dean was set for Tuesday, and prosecutors would likely agree to let him be released to his mother.

It’s common for high schools to close in response to threats, but rarer for universities because of the logistical complexities of shutting such large institutions, said Georgia-based campus security expert Michael Dorn. He didn’t know the specifics of the University of Chicago case but said being too quick to shut down a university can play into the hands of those making threats.

“Overreaction is a real danger,” he said. “That is the goal of terrorism and other violent events. … There’s the goal to obtain notoriety and gain attention.”

Protests that followed last week’s release of the video of McDonald’s killing have been largely peaceful, despite concerns from city officials and community leaders that it might spark the kind of turmoil that occurred in cities such as Baltimore and Ferguson, Missouri, after young black men were slain by police or died in police custody.

The audio-free video shows McDonald walking down the middle of a four-lane street. He appears to veer away from two officers as they emerge from a vehicle, drawing their guns. Van Dyke opens fire from close range and continues firing after McDonald crumples to the ground.

Police have said McDonald was carrying a knife, and an autopsy revealed that he had PCP, a hallucinogenic drug, in his system. Cook County State’s Attorney Anita Alvarez has said the 3-inch blade recovered from the scene had been folded into the handle.

Defense attorney Dan Herbert says his client feared for his life, acted lawfully and that the video does not tell the whole story.

Van Dyke was released from jail Monday after paying the $150,000 required of his $1.5 million bail.

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