This was a rectangular object with a red and green pulsing lights there were two officers which apparently also saw this.

I was heading north on Pacific Coast Highway, my friend and I saw red and green pulsing lights.  As we got closer I could see the silhouette of this object against the dimly lit clouds in the sky.  I turned around to be on the south side of Pacific Coast Highway so I would be closer.  On the north side of Pacific Coast Highway there was a highway patrol on the south side was a Huntington Beach police vehicle.  The officer was outside of his police vehicle with binoculars.  I pulled over and stopped.  I was going to get out when the lights that were pulsing alternately pulsed once simultaneously and were both red.  Then this object started to move slowly southeast down the beach.  I followed it slowly down to the Huntington Beach Cliffs.  Then it just disappeared.
We presume the witness implies an evening sighting.  We have amended the time above.  The date is approximate.  PD