UPDATE 11/2:

Oshkosh Police say an Oshkosh North student who was detained after a lockdown posed no threat to the school.

The department has completed its investigation into Thursday's incident at Oshkosh North.

"After the juvenile was detained and all facts of the incident were determined, it was established that the juvenile posed no threat to the school and at no time was there a weapon involved in yesterday’s incident," reads a statement for Capt. Kelly Kent.

Oshkosh Police Chief Dean Smith says the student, a sophomore, was not armed when he went to school Thursday morning and no guns were determined to be missing from his home.

On Oct. 31, the 16-year-old's mother went to see a school social worker with concerns her teen had been acting erratically. The mother said the student had shot an AR-15-style rifle at the family's property in the Town of Oshkosh, which is located in Winnebago County jurisdiction.

"The social worker spoke with the school resource officer at North who advised her to instruct the parent to report this behavior to the Winnebago County Sheriff's Office," said Chief Smith.

On Thursday, Oshkosh North staff saw the student arrive at school and contacted his mother. They asked her if she had reported her concerns about the child to the Winnebago County Sheriff's Office. She had not. The school resource officer contacted the Winnebago County Sheriff's Office at 9:06 a.m. The SRO asked for help at 9:16 a.m. An officer arrived on scene at 9:18 a.m.

"While this was occurring, the social worker learned from the mother that there may be a firearm missing from the home," Smith said.

The student could not be found in his classroom. The school went into lockdown.

A Snapchat photo from student Kayla Granberg shows students using chairs to block a door during the lockdown.

The lockdown was lifted at 10:15 a.m. and the school day continued as scheduled. Parents were allowed to excuse students from classes for the day. The school has made counselors available for students who may need extra help.

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UPDATE:

An Oshkosh North High School student is being treated at a hospital after concerns of erratic behavior and a report that a gun was feared to be missing from his home put the school into lockdown Thursday morning.

Oshkosh Police Chief Dean Smith says the student, a sophomore, was not armed when he went to school Thursday morning and no guns were determined to be missing from his home.

On Oct. 31, the 16-year-old's mother went to see a school social worker with concerns her teen had been acting erratically. The mother said the student had shot an AR-15-style rifle at the family's property in the Town of Oshkosh, which is located in Winnebago County jurisdiction.

"The social worker spoke with the school resource officer at North who advised her to instruct the parent to report this behavior to the Winnebago County Sheriff's Office," said Oshkosh Police Chief Dean Smith.

On Thursday, Oshkosh North staff saw the student arrive at school and contacted his mother. They asked her if she had reported her concerns about the child to the Winnebago County Sheriff's Office. She had not. The school resource officer contacted the Winnebago County Sheriff's Office at 9:06 a.m. The SRO asked for help at 9:16 a.m. An officer arrived on scene at 9:18 a.m.

"While this was occurring, the social worker learned from the mother that there may be a firearm missing from the home," Smith said.

The student could not be found in his classroom. The school went into lockdown.

A Snapchat photo from student Kayla Granberg shows students using chairs to block a door during the lockdown.

"I started texting my mom, my dad, my uncles, my friends, everybody," Granberg said. "And just a lot of thoughts go through your head, like this could be the moment that you lose everything that you've worked for and it's just so emotional."

Fifteen officers and detectives from Oshkosh Police responded to the school and other locations to prepare for a search.

Five officers and deputies went to the student's home. At this time, it was determined that no guns were missing from the home. The student, however, was not there.

Officers tracked the student's cellphone and found him near the Oshkosh Correctional Institution. He was taken to a hospital for treatment.

Smith says he was not armed when he went to school. Officers continue to investigate why he left school after arriving there Thursday morning.

"The behavior that was actually occurring wasn't criminal in any nature, it was just sort of some erratic behavior," Chief Smith says.

The lockdown was lifted at 10:15 a.m. and the school day continued as scheduled. Parents were allowed to excuse students from classes for the day. The school has made counselors available for students who may need extra help.

"At no time were any of our students and staff members in danger," Dr. Cartwright said.

"All threats to our schools, students, staff are taken seriously and investigated thoroughly," she said.

Chief Smith says Winnebago County has no ordinances against shooting an AR-15-style rifle, so the student was not in violation for doing so on his property in the Town of Oshkosh.

Winnebago County Sheriff John Matz said the student has been cooperating with authorities.

Chief Smith says no decision has been made at this time regarding possible disciplinary actions.

"We want our parents to be vigilant. We want our parents to report anything that's occurring to law enforcement, to the schools if it involves the schools," Smith says. "But if you get information from law enforcement as to next steps, we would like for you to take those next steps."

It was a stressful day for parents of Oshkosh North students.

"It's scary, you don't want that happening to your kid and when reality kicks in, it's a whole different story," says William Andrews, Oshkosh North parent.

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PREVIOUS UPDATE:

Oshkosh North High School was placed on lockdown Thursday morning after a report of an incident involving a student and a gun.

On Oct. 31, Oshkosh Police received information from a school counselor that there had been an incident in the Town of Oshkosh that involved a high school student and a gun.

Police told the concerned parent to report it to the Winnebago County Sheriff's Office.

On Thursday morning, police received word that the student was on Oshkosh North grounds. They discovered that the concerned parent had not reported the incident to the Sheriff's Office. They also learned that "a firearm may possibly be missing from the student's residence."

Police contacted Oshkosh North High School and told them to go into a hard lockdown.

The student was located off school grounds by the Winnebago County Sheriff's Office.

"There is no danger to the public and no one was injured," police say.

The lockdown was lifted at 10:15 a.m. and the school day continued as scheduled.

A news conference is scheduled for noon. Action 2 News will update this developing story.

There were two other incidents at Northeast Wisconsin schools Thursday. Police are investigating a fire that was set in a bathroom at Appleton North High School. No one was hurt.

Wausaukee High School was evacuated after an unknown "incident," according to the Marinette County Sheriff's Office. There were no injuries reported there.

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PREVIOUS UPDATE:

A lockdown at Oshkosh North High School has been lifted following an incident involving a student.

The Oshkosh Area School District says the school was placed on hard lockdown at 9:20 a.m under the direction of the Oshkosh Police Department.

The district says police were looking for a student. The student was located off of school grounds by the Winnebago County Sheriff's Office.

"There is no danger to the students or school," reads a statement from the district.

Police and the school district say they are investigating an "incident involving an Oshkosh North Student." No other information was released.

The lockdown was lifted at 10:15 a.m. and the school day continued as scheduled.

The police department plans to release more information at an 11:45 a.m. news conference. Action 2 News will update this story.