If you noticed police activity at the Capital Mall in Olympia on Monday night, don't be alarmed: the crowd of emergency responders was part of a National Guard training exercise.

Washington National Guard soldiers and airmen with the 10th Civil Support Team conducted a joint training exercise with first responders from JBLM as well as Thurston, Pierce, and King counties.

Crews were training for a scenario in which some type of hazardous material was making hundreds of people sick at the Capital Mall. Crews trained on how to find and identify the hazardous material and then decontaminate the mall and make sure it's safe for people to enter.

It's training they also put to use when sweeping for hazardous materials at high-profile events like the Super Bowl and the upcoming presidential inauguration.