BROOKFIELD, Wis. (CBS 58) -- An active shooter training session was held Thursday afternoon in Brookfield.

Experts were offering tips on what to do if someone starts shooting in a classroom or a church.

The training session was held at the Brookside Baptist Church on Pilgrim Road.

Instructor Brian Zalewski's main message in an active shooter situation was "do something."

"The biggest one being get out. If you can escape from an area, do that. If you can't and you need to confine yourself to an area, you really need to barricade yourself. You need to secure the door somehow, whether it be with makeshift objects in an office such as tables, chairs, boards, computer cords," said Instructor Brian Zalewski.

The day-long session was offered by Applied Tactical Training Academy and one of the today's speakers was Acting Milwaukee County Sheriff Richard Schmidt.