The man's ill-conceived stunt, while technically legal in the open-carry state of Missouri, was nearly guaranteed to inspire fear, coming less than a week after Patrick Crusius shot up a Walmart in El Paso, Texas, leaving 22 dead and injuring dozens more.
An off-duty firefighter held the man at gunpoint until officers arrived.
The incident happened at 3150 W. Republic Rd., according to a Facebook post from the Springfield Police Department.
"All we know is the fact that he walked in here heavily armed, with body armor on, and military fatigues on, and caused a great amount of panic inside the store", said Lt. Mike Lucas with the Springfield Police Department.
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The store manager at the Neighborhood Market pulled a fire alarm, urging people to escape the store.
It was a "really scary, risky situation", police at the scene told media, adding that they would investigate the man's social media accounts to try to determine if a threat was intended.
"His intent was not to cause peace or comfort to anybody that was in the business here", Lucas said.
Springfield police were called to a Walmart Neighborhood Market at about 4:10 p.m. On Sunday, nine were killed in a shooting in Dayton, Ohio. He was carrying a rifle, roughly 100 rounds of ammunition and was walking around the store recording video with a cellphone. "He certainly had the capability and potential to harm people".
This past weekend, there were two deadly mass shootings in El Paso, Texas and in Dayton, Ohio.