someone¹ is furiously dumping US treasuries (AKA "US debt" AKA "the most secure store of value on earth") on the open market, driving interest rates 
and freaking everyone on fintwit the fuck out (interest rates, which go up in response to selling pressure, don't usually move this fast, especially at this time of day).
Worth mentioning that #ScottBessent said that the goal Trump’s 5D chess move w/#tariffs was to drive the rate on the 10 yr treasuries *down* to make it easier for Americans to afford houses etc. Needles to say, up is the opposite of down.
"I used to think that if there was reincarnation, I wanted to come back as the president or the pope or as a .400 baseball hitter. But now I would like to come back as the bond market so I can scare the shit out of everybody."
- James Carville
¹ maybe China [edit] or a japanese bank that just blew up on a massive treasury position (TBD).