OSAGE COUNTY, Mo. - UPDATE 12:20 pm: School officials said the lockdown was caused by a man trying to gain entry into the high school to speak to a student that he was "unhappy" with.
Officials said the man was refused entry but would not leave the campus and tried to get into the student's car.
The man disappeared on campus and could not be located but was located by police at a residence later in the morning, officials said.
Officials said the students were never in danger.
ORIGINAL: The Osage County R-II Schools went on a brief lockdown Wednesday morning.
Officials with the school said the issue that caused the lockdown has been resolved.
Officials have also said this is not connected to the search for Stephen Brandon on County Road 501.
ABC17 has reached out to the school district for more information on what initially caused the lockdown.
Stay with this story for the latest information.