By Phil Mercer
BBC, Sydney

A group of swimmers has told how a pod of dolphins protected them from a great white shark off New Zealand's coast.

The lifeguards were training at a beach near Whangarei on the North Island when they were menaced by a 3-metre shark, before the dolphins raced in to help.

The swimmers were surrounded by the dolphins for 40 minutes before they were able to make it safely back to the beach.

Dolphins prevent NZ shark attack