KANSAS CITY, Mo. -- Kansas City, Mo., School District officials are locking down Central High School Tuesday after a violent day in and and near the school.

Multiple fights broke out inside Central Monday. Just after 1 p.m., another fight forced school officials to call in police reinforcements.

"When you have a large group of people fighting, you must regain control," Kansas City School District spokesman Andre Riley said.

Kansas City police said they had to use pepper spray to defuse some of the fights. A spokesman for the Kansas City Police Department said that a juvenile was arrested. A security officer was kicked in the shin by a student.

After school ended for the day, police said at 4:45 Monday the same students fighting at school earlier in the day met up at 45th Street and Prospect Avenue. Kansas City police confirm as many as 20 teens were fighting when someone opened fire. Three girls and one boy was shot, but none have life-threatening injuries.

Some students say this is a situation that should have been settled before things escalated.

"From the beginning when fighting started should have taken those students out of the building but they were still in the building," Central student Kyoscha Steward said.

Riley said the district plans to do all they can to keep violence out of classrooms. The lockdown will feature an increased security presence throughout the school.

"It's our duty to make sure schools are safe and we will do that," Riley said.