Wisconsin, USA - Sleep is interrupted again for some residents in the eastern Wisconsin city of Clintonville where a series of mysterious booms continued for a second night in a row.

City Administrator Lisa Kuss (KOOS) says it was mostly quiet Monday after a series of rumbles the night before until they started again around 8 p.m. She says they continued throughout night until about 5 a.m. Tuesday.

The noises had been concentrated in the northeast part of the city and overnight Tuesday the reports moved slightly south and west but still within city limits.

Local officials have checked gas lines, sewers, water pressure and consulted seismologists, but have come up empty-handed.

She says it's still coming from underground. They next plan to check the well pumps to make sure they are functioning.