In the past two days, four shark attacks have occurred off the coast of Australia, including one incident near Sydney Harbor where a boy was critically injured while jumping off rocks. CNN's Angus Watson reports. Read more: https://cnn.it/4bF01Vs | CNN International

Four shark attacks were reported in Australia within a 48-hour period, prompting beach closures and warnings. Experts say heavy rainfall is likely to blame as it makes conditions more attractive to bull sharks. CNN Creator Antoinette Radford breaks down the spike. | CNN