How to guard against polar bear attack - an expert explains

Failures by an expedition company did not cause the death of a British teenager mauled by a polar bear in Norway, a coroner has said.

Horatio Chapple, 17, from Salisbury, died while on an adventure holiday to Svalbard with the British Schools Exploring Society in August 2011.

He suffered fatal injuries after being dragged out of his tent.

Returning a narrative verdict after the five-week inquest, coroner Ian Singleton pointed out that the group had been missing items of equipment, including parts of the tripwire alert system.

Polar safety expert Jason Roberts outlines the kind of precautions that would normally be used on expeditions where polar bears live in the wild.