Sydney Beaches Shut Down After Shark Attack Spate; Man Critical

• Over 30 beaches in Sydney's northern suburbs, including all in the Northern Beaches area, have been closed due to multiple shark attacks.
• A man in his 20s is in critical condition after being bitten at Manly Beach on Monday evening.
• Another incident at Dee Why saw a shark bite a surfer's board, though the surfer was uninjured.
• A 39-year-old man sustained minor injuries in a separate attack further north on Tuesday.
• A 12-year-old boy is also in critical condition following a shark bite at a Sydney Harbour beach on Sunday.

Why It Matters: Multiple shark attacks have led to the closure of over 30 Sydney beaches, with several people injured.