I got into my car and thought i saw a flock of birds to the south, but upon closer inspection it apeared to be approximately eight or so fighter planes flying in formation with one further behind the group, fast and low, likely below 5000 feet with no navigational lights on. coincidently my brother saw the same thing and reported that they were to the south of him, likely over elk grove, ca or close. my brother was closer to the formation and reported that these planes made no sound. i missed the objects with the picture below but the objects were in the lighted area of the sky, flying left to right (east to west). the artifacts in the picture are from the flash.