The source of a loud "explosion" heard across Grandville and the surrounding area likely was a bunch of guys at a bachelor party having a great time.

Calls began pouring into the WZZM 13 Information Center and the Kent County dispatch around 8:30 p.m. Saturday, April 15, after many concerned residents not only heard the sound but felt their homes shake.

One report came at least 3.5 miles away from the source, which is in the area of Wilson Avenue and 68th Street SW in Byron Center.

A couple told WZZM 13 they lent their grandson their home for the weekend party. The property has a private gun range with the product Tannerite or something similar; when it's shot by a high-powered firearm, it goes "boom."

Three exploding targets were shot at, the loudest of which was the second shot, which corresponds with other reports to WZZM 13.

Those firing the weapons reportedly are licensed, and Tannerite can be legally purchased at any sporting goods store.

The grandparents wished not to be named given the circumstances and public outcry of the reported explosions. They made their grandchild explain to neighbors what happened, and they apologize.

Police say no one was hurt.

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