There were red, white and blue lights on the front of these triangular objectsI was driving along highway 24 to 680 north when I noticed a few low flying planes or what I thought were planes. What really stood out were the strong light strobes which we sometimes see with helicopters looking for things. However, these were silent and shaped triangular and the common thing that they had were three lights which were red, white and blue. I called the Walnut Creek police department and asked if they knew about these low flying objects and they were very abrupt on the phone and said "no"! They did not want me asking questions it seemed. I am still perplexed as there were many, many of them and when I returned home, I took my husband outside in our backyard and he could not believe it. Sometimes, they did these diving patterns.Neat to watch but I would love to know what they were.((NUFORC Note: We have no idea what the witnesses observed. PD))