Two people have been arrested following knife attacks in Edmonton, North London (Image: GETTY)
Scotland Yard said a second man has been arrested following the four potentially linked stabbings in the Edmonton area. A man in his 40s was arrested at a residential address in Edmonton on suspicion of Grievous Bodily Harm (GBH) and taken into custody at a north London police station. The first man arrested on suspicion of GBH also remains in custody.
Police believe a single male suspect was acting alone and that "mental health issues may be a factor".
The Metropolitan Police said it remains a live investigation and said they are pursuing all lines of inquiry, as they advised members of the public to remain vigilant.
A 45-year-old woman, who was stabbed in the back, and a 23-year-old man are in a critical condition in hospital.
Detective Chief Inspector Stuart Smillie, from North Area Command, said: "We are doing everything we can to apprehend the suspect behind these cowardly and senseless attacks.
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Police believe a single male suspect was acting alone (Image: GETTY)
"We are treating the four stabbing related incidents as potentially linked.
"The four victims are from different backgrounds and appear to have been selected at random due to them being alone and vulnerable.
"We are working on the hypothesis that the single male