Senior police officers have been warned to look out for a new knife which can inject a ball of compressed gas into its victim that instantly freezes internal organs.
The ‘wasp knife’, which can deliver a ball of compressed gas capable of killing its victim at the press of a button, may be heading for Britain, the Metropolitan Police fear.
A needle in the tip of the blade shoots out the frozen ball of gas which instantly balloons to the size of a basketball, freezing organs.
The Metropolitan Police have told colleagues in the West Midlands to be on the lookout for the blade, which is designed to kill sharks and bears.
This replaces the old British method, which involved stabbing someone and then farting in their general direction.