A few days ago, this happened. http://www.guardian.co.uk/world/2010/jan/13/cape-town-giant-shark-attack
Note where they said it happened. I used to tell people about this shark attack in South Africa where a colossal great white killed an elderly woman. Here's that news story. http://news.sky.com/skynews/Home/Sky-News-Archive/Article/200806413249243
I had a feeling the sharks were one and the same, so I did some more digging and found this article about the same attack,just with a little more detail. http://www.iol.co.za/index.php?set_id=1&click_id=13&art_id=qw1100501821 845B262
My initial suspicions were right, in that it was likely the same beach where the elderly woman died. The chances of there being multiple giant great whites at the same area aren't too big.
Ironically, the shark watchers that were stationed to warn people about sharks coming in were posted up following the death of the elderly woman.