The photographs may not be all that unusual, due to what occurs when the shuttle reenters the earth's atmosphere. Here is a brief description;
"Lineberry described what happens next as a function of the speed of the spacecraft and the increasing density of the atmosphere, which translates the kinetic energy of the shuttle into heat.
Early in the descent most of the heat energy is generated by speed of the vehicle dropping through rarefied air. At lower altitude, however, the spacecraft slows down but the air becomes denser, increasing friction -- and heat.
It is not a one-to-one tradeoff, Lineberry emphasized, and the heat load rises dramatically until it peaks, usually around an altitude of 230,000 feet, with the shuttle traveling about 15,000 miles per hour.
By that time, the heat and friction are so great that the air immediately in front of the shuttle becomes ionized, Lineberry said. "This is not air at all, but a plasm that's electrically charged. Radio signals cannot be heard through it."Link to full article;
CLICK HEREThe photographer's description from the article you linked;
"The pictures, taken with a Nikon 8 camera on a tripod, reveal what appear to be bright electrical phenomena flashing around the track of the shuttle's passage....."More disturbingly, however, are the dubious reports that are beginning to pop up around the net describing a bright object seen close to the shuttle just before it began to break up, and of at least one amateur video that shows a 'rod' like object following the shuttle.
Magikman