GRAFTON, WI (WTAQ) - Grafton police report an incident involving a homemade bomb started with an argument between two groups at Lime Kiln Park Friday.

A 21 year old Grafton man and a 20 year old Sheboygan man are thought to be the ones who threw what police call a “bottle bomb” into a car. The people inside that car tossed it back out before it exploded and no one was injured.

When the two suspects were stopped, they had another improved explosive device in their car at the time.

Those two have also been connected to an earlier incident when a similar homemade bomb was lighted and thrown inside an occupied business in Grafton.