Edgewater K-Mart Bombed?

According to the County Police Report dated February 11th, two white males and a white female placed a small device on one of the shelves in the back of the K-Mart in Edgewater, which shortly thereafter exploded.

The store was evacuated and minor damage to merchandise occurred. The suspects were not located.

While this could have been nothing more than a dangerous prank, it could also be something more nefarious. What if it was a practice run for something more deadly?