One person wrote on Twitter simply asking: "Anyone in London just hear that explosion?" Several people replied to say they had heard it too with one saying they'd heard it in Marble Arch, right near the route of the King's Coronation Procession where crowds are already gathering and milling about ahead of tomorrow's festivities. However there are also reports of a loud bang being heard in Brixton and Fulham.
Comment: That's about 6.5 miles away.











Comment: So whilst there's no definitive answer on what it was, the claim that it was thunder seems to be a little weak.
On May 11th, 6 days after the loud bang in London, and 5 days after the confirmed report of a meteor fireball over the UK, another 'gigantic bang' was reported in London: So, it may be that neither incident is related to the surge in reports of fireballs and associated loud bangs, and it's notable that these two reports were in London; however just over a month earlier on March 4th, residents of Leicester reported hearing a sonic boom and feeling their houses shake. In this instance, no explanation for the sound was given by authorities: