Wyandotte High School went on a lockout Friday morning when a weapon was found on campus, according to a spokesman for the Kansas City, Kansas, school district.
According to the spokesman, the weapon was retrieved and a student was in custody, and no one was injured.
The school administration was made aware of the possibility of a student with a gun on campus from a post on Instagram, a social media site, said Edwin Birch, district spokesman.
Administrators and campus police began to search for the student in the building, he said. As they approached him, the student ran out of the building and was apprehended outside, not far from the school, he said.
The staff and police response was quick and swift, addressing the situation as soon as they were made aware of it, Birch said.
The school administration allowed parents to pick up their students early if they needed to do that, but school did not end early, he said.
The crisis incident response team will be available on Monday for students and staff who need the support, Birch said.
The school district is investigating with support from the Kansas City, Kansas, Police Department on how this occurred, and will review what has taken place, in order to address the issue, he said.