I have lived in a dark sky zone in Baja Sur for 35 years and seen everything from Hyakutake Comet to many fireballs. We watch all the showers- moon permitting.
I saw it out my window to the south at 45 degrees and it appeared to be several bright white satellites moving slow. Then I exited the house with my wife and it was a huge fragmentation that took up over a full foot at arms length. It was slow moving and fragmenting as we watched. My guess was Mir Space Station...or asteroid.