Here is something that I have not heard in the news AT ALL. If you listen to the ATC tapes a few minutes prior to the incident, there are reports from pilots to the tower of three people walking around the water's edge between RWY 28L and RWY 28R. I hope this accident wasn't a result of terrorist activity! The recording is not found on the widely available accident audio clip. This portion of the recording, can, however, be found on this website in the archives, and is on the tape at around 25-27 minutes past the hour, and is shortly before the United pilot requested about a 2 minute delay on his departure. Sorry, I don't remember the exact time, but you can find it.