Both at the same time? Could have been that one went flat and the added weight caused the other to fail.
Both on the same side, but at different times? Again, could be that one failed putting extra weight on the other causing unseen damage. And that later caused the other to fail.
Different times on opposite side? Who knows.
A tire that destroys itself due to running on low pressure can result in what looks like a blowout. A TPMS will let you know if a tire is losing pressure so that you can stop before it destroys itself.