Four police officers, two medics and a civilian were injured in what authorities are calling a "minor explosion" at a strip mall just outside Baltimore, Maryland, Monday night.

A spokesman for the Baltimore County Fire Department said that police were called to a nail salon in the shopping center around 9:30 p.m. ET for a report of a former employee on the premises.

At least seven people were injured, including six first responders, in an explosion at a shopping center in Windsor Mill, Maryland, Monday, May 16, 2022.

At least seven people were injured, including six first responders, in an explosion at a shopping center in Windsor Mill, Maryland, Monday, May 16, 2022. (Twitter/Baltimore County Fire Department)

Police confirmed to Fox News Digital that the suspect set a fire that sparked the explosion just after police arrived at the scene.

Four police officers and two medics were taken to area hospitals with non-life threatening injures. The person believed to be the former employee suffered life-threatening injuries.

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Seven people were injured in an explosion at a shopping center just outside Baltimore Monday night May 16, 2022.

Seven people were injured in an explosion at a shopping center just outside Baltimore Monday night May 16, 2022.

The explosion happened at the Libra Nails and Spa inside the Security Station Shopping Center in Windsor Mill. It is located about 12.5 miles outside Baltimore.

Baltimore County fire officials said the explosion may have involved hazardous materials.

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Seven people were injured in an explosion at a shopping center just outside Baltimore Monday night May 16, 2022.

Seven people were injured in an explosion at a shopping center just outside Baltimore Monday night May 16, 2022.

Fire officials said the fire was under control around 10:30 p.m. ET. 

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Pictures show that the nail salon sustained heavy damage with all of its windows blown out.