Hope the problem can be quickly determined. Be a shame to lose the rest of the 2017 launch schedule. Seems possibly related to the first stage booster, a different failure from that experienced with the second stage on CRS-7. At least all of the the pieces should be in the vicinity of the launch pad. One silver lining might be if the failure does center on one or more of the nine Merlin engines, it's better to it fix now, not when there's 27 of them on the pad.