CLAIMS that Ninjas are extinct shows just how deadly they have become, it has been confirmed.

As Japanese newspapers reported that only a handful of Ninjas remain, experts said the legendary assassins had clearly perfected their invisibility skills.

Roy Hobbs, editor of Ninjas and Ninjing, said: “This is the natural and terrifying evolution of the Ninja. To move with such breathless stealth that it seems they no longer exist.

“In fact there are millions of Ninjas. Waiting in the dark. To cut your head off.”