Police have arrested two people and counterterrorism police are also involved in an investigation into the mass stabbing on a London-bound train near Cambridge from Doncaster to London's Kings Cross on Saturday. Ten people have been hospitalized, nine of them with life-threatening injuries. Armed officers stopped the train at Huntingdon station, and the British Transport Police say counterterrorism officers are assisting in the investigation to determine the full circumstances and motive of the attack. CGTN brings you the latest.