From another article on the same subject:
"KNBC-TV reports the installation isnt so much being made because of any crime in the area, but more because of terrorism fears. Reports have been coming in of suspicious people taking pictures and video of the facilities, and both the pier and the Promenade have been the subjects in the past of known al Qaida chatter on possible targets for attack."
http://www.securitysales.com/t_ci_newsView.cfm?nid=2768&numDays=7
So, in reference to "reports have been coming in of suspicious people taking pictures and video of the facilities," how do we know this to be fact?