People across the Northern California city of Woodland were woken up early Tuesday morning by a loud, mysterious boom that rattled windows, set off car alarms and left neighbors wondering what caused it. A home security camera captured a whistle, a flash of light and then a big boom, but police are still looking to uncover precisely what happened. Tap here for everything we know about the investigation into the mysterious boom, which left no fires, damage or evidence of an explosion: https://www