911: Is This A Missile Being Fired???

Here is An interesting 911 picture obtained from http://www.robkettenburg.net/ which clearly shows very fast moving black 'objects with a trajectory path starting from the bottom right hand side of the image and heading to the top left hand corner of the image; seemingly into or behind WTC 1.

Seemingly, this is taken moments after the devastating impact of the 2nd plane into WTC 2 which can be sadly observed on the middle left of the picture.

IS THIS A MISSILE BEING FIRED? If not ... what is it?? Remember an earlier reference to a UFO like object sighted in the video of the 2nd plane crashing into the 2nd tower? The approximate locality of this 'unknown black trajectory' is that of the UFO.