Emergency at SAN Mon 5-6-2013

I was just listening to SAN ATC chatter on liveatc.net, and I heard there was some sort of emergency (medical?) and saw via FA.com that some planes were holding and others were diverting. This all happened at around 1130 PDT. Anyone got any more info?

Edit: I know DL857 JFK-SAN diverted to ONT. Other planes were circling over the ocean, and I can quote an air traffic controller that some of the planes had “critical fuel”. Any info would be greatly appreciated!

I just had a quick listen. It seems poor weather near the runway was the root of the trouble which caused many aircraft to go around and then divert.