In Springfield, Missouri, a 20-year-old white man wearing body armor sparked panic and chaos Thursday morning when he showed up at a Walmart store carrying two loaded guns and over 100 rounds of ammunition. The man proceeded to push a shopping cart around the store, filming himself on a cellphone. A manager triggered the fire alarm and called police. The man was detained at gunpoint by an armed off-duty firefighter before police arrived and arrested him without a shot being fired.