A SpaceX rocket prototype, known as SN10, soared over South Texas during test flight Wednesday before swooping down to a pinpoint landing near its launch site. Approximately three minutes after landing, however, multiple independent video feeds showed the rocket exploding on its landing pad.

The chemical substance used to kill Kim Jong Nam was VX nerve agent, according to a preliminary report by the Chemistry Department of Malaysia, Malaysian police said in a statement Friday. Kim, the half-brother of North Korean leader Kim Jong Un, died February 13.