A triangular unidentified object hovered over an industrial plant in San Francisco, California, USA on June 6, 2016. A channel registered to YouTube under the name Alien Species provided a recording of this event (see video below).
A local resident observed a gray triangular UFO with convex hemispheres above and below the flat body of the object. It hung motionless in the cloudy sky above the factory buildings and slowly revolved around its axis.
San Francisco is home to oil refining, electronics and aerospace industries, which, for sure, may be of particular interest to alien intelligence. The video behind the fenced area shows a tall structure with windows and circular structures on the roof, a workshop building and cylindrical storage facilities, similar to oil tanks, with cone-shaped roofs and fences.
In this case, it is not clear whether the UFO is observing something happening in the fenced area or waiting for someone at the designated rendezvous point.
Voronina Svetlana