Has this subject already been discussed? Residents of the old part of town around the historic district and around Lake Natoma have been hearing very loud explosions over the last year or so. They tend to be one or two blasts only, late at night and not accompanied by any flashes or other noise. These are not gun shots, fire works or fire crackers. They are like small bombs going on. Lately they have been strong enough to echo and reverberate throughout the canyon. They usually occur about an hour to two hours after sunset. Its very difficult to get an effective police response (although they tell people to call them in) because this is happening apparently in forested areas areas where they can't be observed and where they can flee before a police car can respond.
The blasts seem to be getting more powerful, although its somewhat difficult to tell.
I apologize if there is already a thread about this. I just wasn't sure how to do a subject search. Its a little concerning because it would seem someone has a fascination or hobby building bombs and, if they are getting bigger, where is this leading?