Was SpaceX rocket hit by a drone?

A grainy video uploaded to YouTube appears to show a small object flying over the SpaceX rocket moments before it exploded. SpaceX said an'anomaly' had occurred while the rocket was being loaded with fuel. No was injured in the blast. The rocket's payload, an Israeli-built communications satellite for Facebook due to launch on Saturday, was also destroyed. A video of the blast, posted to the site by Steve Svensson, appears to show a silver spherical object flying close to rocket when the blast happened.