NEWS.com.au | What the hell was that sound over Sydney? NEWS.com.au SYDNEYSIDERS were jolted out of their sleep at 4:30am when a series of bangs shook the city. What caused the sounds? Benedict Brooknews.com.au@BenedictBrook · news.com.au. May 24, 201712:45pm. Video; Image ... Explosive thunder sparks concerns for Sydneysiders Frightening boom wakes Sydney at 5am |