Please turn on JavaScript. Media requires JavaScript to play.

The Royal Navy says it has seized its largest haul of cocaine, with an estimated street value of £240m.

The Portsmouth-based frigate HMS Iron Duke seized more than five-and-a-half tonnes of the drug from a 138ft fishing boat off the coast of South America.

The Royal Navy and US Coast Guard jointly intercepted the boat after it was spotted by a navy helicopter crew.

Frank Gardner reports.