A 16-year-old boy had a lucky escape from a shark’s jaws in a horrifying attack at a popular NSW surf beach on Sunday afternoon.

The teenager was reportedly bitten on the right arm and right leg while swimming at Norris Head, Cabarita Beach, on the NSW far north coast.

He received “traumatic” injuries and was flown to Gold Coast University Hospital in a stable condition.

Chilling footage appears to show the shark chasing the victim into the shallow water as three surfers come to his rescue and rush to get him out.

Onlookers scream as the ominous shark fin can be seen lurking only metres behind its victim.

In the clip posted to Instagram, three surfers in wetsuits grab the injured teen and drag him onto the shore. Other terrified surfers and swimmers can also be seen hurrying to escape the water.

The ocean predator then turns and swims away to deeper sea.

The brave bystanders carried the shark victim up the beach, which is between Byron Bay and Tweed Heads.

Bystanders tied a tourniquet to stop the bleeding before paramedics arrived, a NSW Ambulance spokesperson said.

Among those helping the victim were reportedly two off-duty paramedics.

NSW Surf Lifesaving CEO Stephen Pearce told the ABC the boy was bitten on his right arm and right leg after being attacked while swimming.

“At this stage, I’m unsure of the severity of injuries. But I’m told there were traumatic injuries to the right arm and right leg,” he said.

“I’m not sure whether he was with any other friends at the time of the incident, but by the time our lifeguards got there he had already had a tourniquet applied to those impacted limbs,” Pearce said.

Pearce told the ABC that with whales migrating at this time of the year, there was always more shark activity.

“Cabarita Beach is a beautiful, picturesque beach and unfortunately I think it might be a case of ‘wrong time, wrong place’ at this stage for the young fella,” he said.

He said the beach would remain closed until Monday.