UPDATED | March 31, 2017 10:25 PM

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MIDLOTHIAN (CBSDFW.COM) – Midlothian Police said around 10:00 p.m. they have located the possible source of the explosion and have units on scene.

The possible source is a product called Tannerite, the brand of an exploding target used for firearms practice.

Midlothian Police confirmed around 9:30 p.m. they were aware of reports of a possible explosion.

The department said on its Facebook page around 9:30 p.m. Friday first responders are trying to determine the source.

People reported hearing a loud boom and houses shaking.

Early on, police were asking residents to refrain from calling unless they have an emergency.

There were no reports of injuries.

More to come.