Alcântara is in the news because of a new agreement between the US and
Brazil, so I ended up reading about the VLS-1 solid rocket incident
that killed 21 people there. Does anyone have a good reference for
what was found as root cause, or did it never get less vague that the
articles linked from the Wikipedia article?
https://en.wikipedia.org/wiki/VLS-1_V03
Similarly, was there any formal or informal investigation into the
unintentional stage ignition that happened at Black Rock at one of the
recent events there?