Three teenagers and a man have been arrested on suspicion of murder.
The Bedfordshire, Cambridgeshire and Hertfordshire major crime unit have launched a murder investigation and are treating both incidents as connected.
Detective inspector Lee Martin slammed the attacks as ‘appalling violence’ which has ‘cost a teenage boy his life and left two others in life-threatening conditions’. ‘We are doing everything we can to prevent any further incidents and we want to reassure the wider community that officers are pursuing all lines of enquiry as well as carrying out increased patrols in the area.
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