kgo.com is a San Francisco radio station, you can listen on the computer to it.
I listened to the 1 am news, there was not a word about an increase in the alert.
I had heard earlier that the Bart systems, an above ground
subway/train (I think) were being given extra protection, due to the New York subway alert.
BART also runs under the bay. If they blow something up there it could blow a hole in the tube thus winding up with the bay in the tunnel. I'm not sure how many people are on one train??