The latest incident occurred Tuesday morning at Oshkosh West High School, about 50 miles southwest of Green Bay. The Oshkosh Police Department wrote on Facebook that an armed student had confronted a school resource officer. Both the officer and the student were injured and taken to local hospitals.

Police said there were no other injuries. Students were being taken to a nearby middle school to be picked up by their parents.

The Wisconsin Division of Criminal Investigation will conduct an investigation, police said. No one answered the phone at the high school on Tuesday.

An eerily similar incident occurred about 80 miles south on Monday, in Waukesha, Wisconsin.

An officer there shot and injured a 17-year-old boy who had pointed a gun at law enforcement authorities as they were trying to persuade him to hand it over, officials said.

The episode unfolded at Waukesha South High School around 10:17 a.m., after a student informed authorities that another student had a handgun, Chief Russell Jack of the Waukesha Police Department said.

The student was taken to a hospital and was in stable condition, the chief said. No one else was injured.

Less than three hours later on Monday, there was another report of a student with a gun at Waukesha North High School, about 4 miles away, police said in a statement on Facebook.

The school was locked down during a search, and police officers determined that the student believed to be carrying the weapon was no longer at the school.

The police then went to the student’s house and arrested the suspect, a 15-year-old boy. Police found “a facsimile firearm” hidden in the house, they said.

And in Sparta, Wisconsin, in the western part of the state, classes for all grades were canceled on Tuesday because of reports of a missing handgun.

The Sparta Area School District said in a statement that Sparta High School had been put on lockdown Monday afternoon after administrators received information about a missing handgun “that was potentially in the possession of a student.”

“While this information was unconfirmed, we perceived it to be a credible safety concern and treated it as such,” the statement said. “This student was not present in any of our school buildings today. The student’s whereabouts were and continue to be unknown.”

Officials canceled activities and classes throughout the district on Monday evening and Tuesday, and said they were working with law enforcement officials to resolve the matter.

This article originally appeared in The New York Times .