[Ed. – Sounds like this one must have a human-linked explanation, if it’s happening repeatedly at the same time of night. But so far, local authorities haven’t been able to find it. Add it to our growing list of mystery booms.]
Investigators in the Denver suburb have received dozens of reports of a loud “boom” happening overnight.
Neighbors have said the noise, which some describe as an explosion or a gunshot, only happens once around 3 a.m. typically over the weekend. The noise, according to reports, only happens once, but has been occurring for months now.
“I was dead asleep and ‘What was that?’ and then I’m back asleep. Now it seems like even more of a mystery,” says Sara Anthony of Wheat Ridge. “You can hear it a ways away, but it’s loud enough to wake me up.”