A mysterious booming sound is keeping residents in Clintonville, Wis., awake at night.
Clintonville is a town of about 4,600 people located about 40 miles west of Green Bay.
For the past four nights, the explosions have disturbed sleepers, rattled houses, and even caused property damage.
The strange noises have been described like distant thunder, fireworks, or someone slamming a heavy door.
No one has been able to figure out what's behind the loud sounds, but residents are desperate for them to stop.
"My husband thought it was cool, but I don't think so. This is not a joke," said Jolene Van Beek, who awoke early Sunday to a loud boom that shook her house. "I don't know what it is, but I just want it to stop."
About 300 townspeople gathered at the local high school for meeting on Wednesday. They wanted to figure out the best way to get to the bottom of of the mystery sounds.
The city has hired an outside engineering firm to investigate.
A seismic station near Clintonville has recorded unusual ground shaking since Sunday night. Scientists say such activity can be caused by mining and heavy truck traffic, but since there are no mines or major construction in the area, the Wisconsin Geological and Natural History Survey will take a closer look at the data.