SpaceX blast investigation suggests breach in oxygen tank's helium system

By Irene Klotz DALLAS (Reuters) - A SpaceX rocket that burst into flames on its launch pad ate the beginning of this month likely suffered a large breach in its upper-stage helium system, the company said on Friday. SpaceX, owned and operated by technology entrepreneur Elon Musk, was fueling a Falcon 9 rocket on the launch pad in Florida on Sept. 1 in preparation for a routine test-firing when a bright fireball suddenly emerged around the rocket's upper stage. "At this stage of the investigation