A threat prompted authorities to arrest four people and Whitmore Lake Public Schools officials to cancel classes in the district Wednesday, the superintendent announced.

Tom DeKeyser learned about “a threat of violence against one of our buildings” on Tuesday afternoon and alerted Northfield Township police, he wrote in a message on the district Facebook page.

“Individuals were taken into custody, however, the case is still considered ‘active,’” the post read. “As such, I am taking the added precaution of canceling classes in all buildings tomorrow. This will give the police, who are working through the night, added time to conclude the investigation.”

DeKeyser did not release other details but said he would update parents and staff Wednesday. Police say they recovered a weapon. All four suspects are current or former students in the school district.

The closure is the latest incident in which regional officials responded to threats after the Feb. 14 school shooting in Parkland, Florida, that left 17 people dead.

Belleville High School was closed Tuesday after a phoned-in threat to police, the Van Buren Public Schools district announced.

There have also been lockdowns, evacuations and charges issued for several teens across Metro Detroit.

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