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A Great White Shark, up to four metres long, was spotted in waters nearby competitors in yesterday's Rottnest Channel Swim.
Swimmers within a one-kilometre radius of the area were picked up and had their competition number cancelled.
The race continued as normal after the shark wasn't seen for more than half an hour.
But those who had been pulled from the water still wanted to compete.
Some chose to get back in and finish, but their times weren't officially recorded.
Got pretty wild on race radio after a shark sighting lead to a lot of swimmers being forced to pull out at #rottoswim pic.twitter.com/udx88kLIzk
— Tom Fee (@thomfee) February 24, 2018
Dammit. Who forgot to put the bungs in? #rottoswim pic.twitter.com/SkYli6MSNU
— Holy Night 👣🌿 (@h_mknight) February 24, 2018
Thanks to all our supporters, our #rottoswim team raised more than $2000 for @SoldierOnAust today! A Great White Shark cut our race short but we still reached our fundraising goal 🏊♀️💖 pic.twitter.com/54D61f6xQc
— Sharon Mascall (@sharonmascall) February 24, 2018