Three shark attacks occurred in Sydney waters within 48 hours, leaving a man in his 20s critically injured at Manly Beach and a 12-year-old boy fighting for life in hospital. Bull sharks are believed to be responsible for the attacks, drawn to the area by summer temperatures above 19 degrees and heavy rainfall that stirs up their food sources. All beaches across Sydney's north have been closed to swimmers as authorities advise the public to stay out of turbid waters until conditions clear. | Sun

With many Sydneysiders still nervous to enter the water following a spate of bull shark attacks over the past few weeks, we put the safety of several popular swimming spots to the test. #9News Watch the full story: https://youtu.be/IEzMsbYSYC8 | 9 News Sydney

Meet the world's largest bull shark ever recorded. Don't miss more Sharkfest tonight at 8/7c. | National Geographic