HOUSTON—Houston police are investigating after a homemade bomb exploded at the front entrance of a Walmart in southwest Houston late Wednesday.

Police said someone placed a plastic bottle with a Magnesium strip loaded with fluid near the front door of the store located on Kirkwood at Westheimer. The makeshift bomb exploded around 11:30 p.m.

The explosion was so loud, an HPD unit driving on the street heard it and rushed to the scene.

The HPD bomb squad came out to investigate, but the store was never evacuated.

Police said the explosive device was placed in a corner undetectable by surveillance cameras.

There were no injuries reported.

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