Police have arrested two men after a spate of random stabbings in north London.
The first attack took place on Saturday evening (UK time) in the suburb of Edmonton when a woman was approached from behind and stabbed in the back while walking alone along a residential street.
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Three identical attacks then took place in the same area of London over the following 14 hours, leaving two victims in a critical condition and two others with serious injuries.
London Metropolitan Police are treating the attacks as linked and just one offender was initially suspected of carrying out the attacks.
However, two men have now been arrested on suspicion of causing grievous bodily harm and both remain in custody.
Police say the attacks seem to be completely random and not motivated by theft or in response to any offence.
"The four victims are all from different backgrounds and appear to have been selected at random due to them being alone and vulnerable. There is nothing to suggest this incident is terror related," a spokesperson for London Metropolitan Police said.
"The motive from the stabbing appears to be solely to inflict harm. Early accounts suggest none of the victims were robbed or engaged in conversation before they were attacked."
Despite the arrests, police are urging the public to remain vigilant and report any suspicious activity.