Two star-like lights chasing each other at an incredible speed

I was in the parking lot of my office at Albany, CA, walking towards my car at around 8:00 PM on 12/17/2009.  I was facing north east when I saw two star-like objects just above the Berkeley hills.  I paused for awhile to look thinking that these maybe falling stars but the trajectory of the movements were about horizontal (zig-zagging smoothly) and one star-like object following (chasing?) the other.  These two star-like objects looked about 5-10x larger than an airplane in the night sky but moving much faster (maybe >> 20x ).  The objects were also much closer to the ground.  The objects were in the sky for about 5-10 seconds before disappearing in the horizon at a much faster speed.  The star-like objects' flickering “arms” were mostly white with a few red and blue.  I know how an airplane or helicopter looks like in the night sky and these star-like objects were very different.  These objects moved so much faster!