It’s like that Chem plant explosion in China or the Beirut blast, people recording video were surprised when the sound and blast wave hit some moments after the BOOM.
Believe the sound blast travels at 1000 ft per second. Light goes at 186,000 mps, so you so the blast almost instantaneously, but the sound has to catch up.
Indeed, the lack of photo-documentation points to these being mere sonic booms.
If they instead were "blasts" - with smoke, wreckage, and craters - there'd be footage on the Internet.
Regards,