Police, residents and experts puzzled mysterious source of loud noises and shocks that have heard and felt in the state of Wisconsin. Abnormal manifestations continued for the last three days, and caused panic among the local population. Many residents left the city Clintonville.
Police said they have received more than 250 calls about loud and strange sounds, as well as reports of concussion of the soil in the north-eastern part of the city near Green Bay, Wisconsin is home to about 5,000 residents.
Scientists from the University of Wisconsin, said that these phenomena may be linked to seismic activity.
A little earlier the mysterious knocking destroyed an old barn in the town of Souk (Vancouver Island, British Columbia (Canada), the event took place on 15.03.2012.