LEE COUNTY, Fla. -- Deep shaking and rumbling sounds rung out in Cape Coral again Monday morning, rattling sliding glass doors and leaving residents wondering what's causing it.
Numerous residents contacted Fox 4 by phone and social media after the rumblings were felt between 10:45-11:00am Monday. The sensation was reminiscent of similar rumblings last month that police say were part of training exercises by military air units.
Dozens of residents responded on the Fox 4 Facebook page, saying they heard or felt the rumblings in all sections of Cape Coral, with reports also coming from surrounding areas such as Englewood, Boca Grande, Pine Island, and parts of Fort Myers. Several people south of Naples also reported hearing and feeling the sound.
Some chalk it up to road construction in Cape Coral, some think it's seismic activity, and some blame fracking.
Another possible source could be from the military, which began a training exercise called Solid Curtain-Citadel Shield 2016 on Monday, with plans to continue through next week. "The exercise consists of approximately 300 field-training exercise events on and off Navy installations across the country," reports the Navy.
However, a Navy spokesperson tells Fox 4 that "We do not have east coast based aircraft currently operating in that area."