Possessing a ninja sword is to be banned in the UK and carry a penalty of up to six months in jail, the British government said on Thursday, in a bid to curb what it has called a "national" knife crime "crisis." The Home Office said most ninja swords had a blade of between 14 and 24 inches (36 and 61 centimetres), with one straight cutting edge and a tanto style — or sharply-angled — tip. From August 1, anyone caught in possession of a ninja sword in private could face six months in prison. That is set to rise...