There's been another shark attack near Byron Bay

A shark has bitten a man on the New South Wales far north coast, not far from the spot where a Japanese man died in February after being attacked.

The 32-year-old is in a critical condition after suffering significant injuries to his lower legs at Lighthouse Beach, a popular surfing spot and the main swimming beach in Ballina, 20 minutes south of Byron Bay.

He was bodyboarding with friends at around 10am when he was bitten. His friends helped him to shore and raised the alarm.

He was treated at the scene by paramedics and is expected to be airlifted to Gold Coast Hospital.

Lighthouse Beach, and all beaches within Ballina Shire, are closed for the next 24 hours.

The incident occurred not far from the mouth of the Richmond River, which flows through the seaside town.

The adjacent beach is where Tadashi Nakahara, 41, died after a suspected attack by a great white shark five months ago.

That attack occurred just 24 hours after another surfer was bitten by a 2-metre shark just a few kilometres further up the coast at Seven Mile Beach, Lennox Head, between Byron Bay and Ballina.

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