Near the fourth, people are reportedly using tennis balls as big, illegal firecrackers. Abandoned tennis ball bombs have reportedly been found in both neighborhoods and in remote areas.

A homemade tennis ball bomb exploded in a Milwaukee neighborhood, damaging vehicles and garages, with police seeking public assistance.

SEATTLE -- If you come across an abandoned tennis ball lying on the ground, be careful about picking it up. It could be someone's explosive idea of July 4th entertainment.Especially around the 4th ...

With the Fourth of July around the corner, police are reminding dog owners to look out for tennis ball bombs.