By the time they got to the last wall, authorities heard a single gunshot, the source said. Then flames began to spread through the structure, and gunshots, probably set off by the fire, were heard."

The vid and this statement dont match up. The gunshots were not ordinance exploding from a fire. Very distinct rapid fire shots, hammer hitting shell.

The question is: was it the police who were firing or Dorner. The cops on the other side (near the camera) were hiding and returning fire...