LOUISVILLE, Ky. (WDRB) -- For the second time in less than two weeks, the Madison Police Department is investigating after an explosive device was detonated.

The latest explosion happened March 16 in the driveway of a home in the 100 block of Cherry Trace, near Michigan Road. Madison Police Chief Dan Thurston told reporters at a news conference that the device detonated in the driveway of a local Jefferson County judge.

On Sunday, March 6, police say an explosive device detonated near the entrance to City Hall in Madison. That's why police believe members of law enforcement and the criminal justice system are being targeted. 

 "We are considering these explosions as a message and a direct threat to members of the criminal justice system," Thurston said. "If you are a neighbor or a family member of a judge, prosecuting attorney, defense attorney or police officer, please be vigilant and observant in your area."

Thurston described the device as a homemade "powder explosion" with some sort of fuse that had to be lit. He said it appears whoever set the device had plenty of time to get far away before it detonated.

We spoke with Evan Hensley, who lives not far from one of the explosions. He says neighbors are worried and don't know exactly what happened. 

"That's the scary part," Hensley said. "We don't know if it fell down the driveway or rolled because our cars were parked up farther. So if it was thrown up there, it might have been underneath a car. It could have been much worse or if it would've been closer to the house it could have caused much more damage as well. It's very unnerving in this community to have this going on."

If you have any information on these cases, you are asked to call Detective Lieutenant Ty Eblen or Detective Lieutenant Jonathon Simpson at the Madison Police Department at (812) 265-3347, or the ATF tipline at (888) ATF TIPS.

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