The state Fire Marshal's Office has suspended the license of a fireworks company that left unexploded fireworks shells in Waltham after the recently July 4 show. 

That company, Pennsylvania-based Pyrotecnico, also staged displays in Newton, Milford, Hingham, Winchester, Westford, Sharon, Wilmington, Ayer and Marion, according to the Boston Globe. 

A city worker mowing a lawn in Waltham ran over an unexploded shell on July 9, causing it to explode, according to the Globe. Other towns, including Stoughton, have reported similar instances in the past week. The lawnmower protected the worker from injury.

The Fire Marshal's Office has also ordered the company to return to the impacted towns and search for any additional shells, according to the Globe.