Supposing San Fran is a target, one wonders what they'd be after.
Several possibilities:
1. Golden Gate Bridge
2. Disrupt international flights forpeople headed to the Olympics
3. An actual attack on an international flight
4. TransAmerica Tower
5. Gorby's think tank (at the Presidio, right?)
At any rate, if the idea is to attack San Fran, a good way to start would be to put the cops on pins and needles, spread them out, and then hit where they're not.