Experts believe a large shark filmed attacking a group of dolphins off a Cornish beach could be a Great White.
Tourist Nick Fletcher filmed the shark less than 180m off Porthmeor beach near St Ives in Cornwall.
His video, which you can watch here on the Sun's website, shows a massive shark trying to attack the dolphins.
The Sun says that Fletcher was videoing the dolphins and did not realise the shark was hunting among them until he watched the footage at home.
Richard Peirce, the Chairman of the Shark Trust, was reported by the Sun to have said that the 3.7m/12ft shark was definitely predatory and that there was every chance it was a Great White.
Peirce said: "It clearly has a white belly like a Great White. And something about the way it breaches " twisting as it leaps out of the water " also suggests it is. I'm very excited at the prospect."
"If a Great White is in the sea close to bathers, lifeguards have orders to clear the beaches."