The lack of fragmentation from the first event suggests event #2 would have been...

TrevorJ · on June 28, 2015

They said in the press conference that it wasn't a commanded event.

001sky · on June 29, 2015

Press conference said that range safety didn't command the FTS (flight termination system) and there is no data (yet) that FTS enabled, but that's doesn't mean the on-board FTS didn't activate itself. It certainly looked like a controlled explosion...

Comment from Reddit that may be useful.

https://www.reddit.com/r/space/comments/3bejxp/spacex_crs7_h...