SpaceX had been bucking the trend with 18 successful missions. This morning, a launch of their Falcon9 on an International Space Station resupply run disintegrated shortly before first stage shutdown.
Though it's been labeled "explosion" it's not clear to me from the footage whether that's the right description. The first stage engines continue to burn smoothly through most of the event. It appears there is some rupture or tear in the upper stage and the rocket got basically torn apart by aerodynamic forces. Less "burst", more "shred."
No details on causes released as of yet. SpaceX is looking at the data. Again, this was an unmanned vehicle so no lives were at stake. Though it is the second ISS resupply mission to have failed, making it important that the next reach the station.
In other space news, New Horizons is about to make its pass around Pluto! 17 more days.