An area of several Pennsylvania cities is experiencing late night booms that are having residents concerned. The booms are described as sudden and earthquaking, leading some to speculate they are sonic booms from aircraft. But the booms are reported as occurring only from 2:30 AM to 4 AM in the morning. This makes it unlikely they are caused by aircraft since pilots as a matter of practice do not repeatedly break the sound barrier over towns at 2 in the morning. And then there's this intriguing detail: "Ficco said two of his officers have heard the unidentified noise, and one of them also saw a flash of light. "There was a flash of light and maybe several seconds before he heard the sound, and then the other officer who was further away heard the sound later than he did," the police chief told WPVI. "They both thought it was coming from different directions." https://abcnews.go.com/US/pennsylvania-r...d=55407783 What do you think is causing this? Speculations welcome. Here's the news clip on the phenomenon. BTW, this is not a phenomenon exclusive to Pennsylvania. Apparently this has been going on for some time all across the world, mainly in the United States. This is one man's explanation for the phenomenon.