Edmonton: Police operate in the area following stabbings top stories direct to your inbox SUBSCRIBE Invalid email Sign up to receive our rundown of the day'sdirect to your inbox When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. 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. READ MORE: Named: Man killed for £60,000 watch as killers fled to nearby mosque Two people have been arrested following knife attacks in Edmonton, North London Police believe a single male suspect was acting alone "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 suspect is acting alone and mental health issues may be a factor. "All of the people he has targeted have been walking alone and he has approached from behind without warning. The Met police believe "mental health issues may be a factor" "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." The first stabbing took place at 7.02pm on Saturday at Aberdeen Road where the 45-year-old victim suffered a stab wound to her back after being attacked by the man. She was taken to an east London hospital where she remains in a critical condition. The second incident took place four hours later at around 12.15am with reports of a male suffering stab injuries in Park Avenue. The 52-year-old man was taken to an east London hospital for treatment of stab injuries. His condition is not life threatening. The third incident was at 3.55am with reports of a man stabbed at Seven Sisters Tube station. The 23-year-old man suffered stab injuries and remains in hospital in a critical but stable condition. Two victims are in critical condition in hospital Edmonton stabbings: Police urges public to 'remain vigilant'<doc-sep>Police patrolled the streets overnight and searched an area in north London where a spate of random stabbings left four people injured. Police say all four victims were attacked from behind as they were walking alone. Two are in a critical condition. Two men are being held on suspicion of grievous bodily harm but police have warned the investigation is "live" and members of the public should "remain vigilant". Officers are continuing to search the Edmonton area and were patrolling the streets in cars and on foot throughout Sunday evening. Please use Chrome browser for a more accessible video player Public told to 'remain vigilant' after random stabbings The attacker is believed to be a single male who is described as black, about 6ft 3in, of skinny build and wearing dark clothing, possibly a hooded top. Advertisement A man was arrested shortly before 11am on Sunday in Edmonton and another man, in his 40s, was later arrested at a residential address in the same town. Both suspects remain in custody. Following the second arrest, the Met Police said in a statement: "This remains a live investigation and police are pursuing all lines of inquiry. "Members of the public are advised to remain vigilant and to report anything suspicious to police." Image: The aftermath of the most recent stabbing in Brettenham Road The first victim was a 45-year-old woman who was stabbed in the back in Aberdeen Road at about 7pm on Saturday and remains in a critical condition in hospital. A 23-year-old man who was attacked near Seven Sisters tube station shortly before 4am on Sunday is also in a critical condition. Two more victims were stabbed in Park Avenue and Brettenham Road, but their injuries are not believed to be life-threatening. Image: The four stabbings took place over a time period of 14 hours Acting Detective Chief Inspector Stuart Smillie said police are doing everything they can to "apprehend the suspect behind these cowardly and senseless attacks". He added: "We believe the culprit knows Edmonton and may well be from the area. "The motive for the stabbing appears to be solely to inflict harm." "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. Image: The 'random' stabbings in Edmonton, London were linked by police "We are working on the hypothesis that the single male suspect is acting alone and mental health issues may be a factor. "All of the people he has targeted have been walking alone and he has approached from behind without warning." Dervish Husseyin, 60, witnessed the aftermath of the first stabbing while he was visiting a friend's house in Aberdeen Road. "I seen the woman lying down, face down," he said. Mr Husseyin said the woman had "blood on her back" but seemed unaware she had been stabbed, saying she had been "beaten up". Image: Police teams are scouring the Edmonton area for the 'random' knife attacker "She said she only went out for a walk on her own," he added. He said a man who claimed to have witnessed the attack described seeing two black men. Natasha Cameron, 45, lives in Aberdeen Road and was walking home from work at a nearby casino after 10pm. She was told there had been a stabbing by officers but was unaware of the later attacks. "I'm scared now because I always walk here from work home," Ms Cameron said. "Now I'm definitely taking the bus."<doc-sep>“We are doing everything we can to identify & apprehend the suspect behind these cowardly & senseless attacks. A large additional police response is now working throughout the #Edmonton area to help keep the public safe. Our advice is carry on but remain vigilant.” A/DCI Smillie pic.twitter.com/uLnVnpc3MV<doc-sep>Detectives are hunting for a man suspected of stabbing four people in a series of random knife attacks in the Edmonton area of north London. Two of the victims, a 45-year-old woman and a 23-year-old man, are in a critical condition in hospital while two other men suffered serious injuries. The Metropolitan Police is linking all four attacks, and investigators believe each victim was selected at random and stabbed from behind without warning between 7pm on Saturday and 10am on Sunday. The suspect is described as a black man, approximately 6ft 3ins tall, of skinny build and wearing dark clothing, possibly a hooded top. Scotland Yard said there was nothing to suggest this incident is “terror related” but urged the public to “stay vigilant”. Investigators believe mental health issues are a possible factor behind the attacks. 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A major manhunt is under way after a knifeman stabbed four people in the back at random in separate attacks in north London. Two of the victims are said by police to be in a critical condition, while the other two have been described as stable. Police are scouring the Edmonton area for a single male attacker, who is described as black, about 6ft 3ins, of skinny build and wearing dark clothing, possibly a hooded top. Image: Forensics officers are investigating the attacks in Edmonton, north London A man was arrested on suspicion of grievous bodily harm shortly before 11am in Edmonton. Officers made a second arrest at a residential address in Edmonton later this afternoon. The second man, in his 40s, is also being held on suspicion of GBH, and both remain in custody. Following the second arrest, the Met Police said in a statement: "This remains a live investigation and police are pursuing all lines of inquiry. "Members of the public are advised to remain vigilant and to report anything suspicious to police." All four victims had been alone at the time and attacked from behind without warning. :: First attack A 45-year-old woman is in hospital in a critical condition after being stabbed in the back in Aberdeen Road at about 7pm on Saturday. :: Second attack A male victim was stabbed four hours later in Park Avenue. He was taken to hospital for treatment but his condition is not life-threatening. :: Third attack Shortly before 4am this morning police received reports of a man stabbed at Seven Sisters tube station, but investigators believe he may have sustained his injuries in Silver Street, Edmonton. The 23-year-old remains in hospital in a critical condition. :: Fourth attack The most recent stabbing took place just before 10am this morning in Brettenham Road in N18. His injuries are potentially life-changing. Image: The aftermath of the most recent stabbing in Brettenham Road Acting Detective Chief Inspector Stuart Smillie said police are doing everything they can to "to apprehend the suspect behind these cowardly and senseless attacks". He said: "We believe the culprit knows Edmonton and may well be from the area. "The motive for the stabbing appears to be solely to inflict harm." He added: "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. "We are working on the hypothesis that the single male suspect is acting alone and mental health issues may be a factor. Image: The four stabbings took place over a time period of 14 hours "All of the people he has targeted have been walking alone and he has approached from behind without warning." Dervish Husseyin, 60, was at his friend's house in Aberdeen Road when the first stabbing took place. "I seen the woman lying down, face down," he said, adding: "She said they had beaten her up." Mr Husseyin said the woman had "blood on her back" but did not seem to realise she had been stabbed. "She said she only went out for a walk on her own," he said. Image: Police teams are scouring the Edmonton area for the random knife attacker Mr Husseyin said a man who said he witnessed the attack described seeing two black men. Natasha Cameron, 45, lives in Aberdeen Road and was walking home from work at a nearby casino after 10pm. She said she saw officers on her road who told her there had been a stabbing but she was unaware of the later attacks. "I'm scared now because I always walk here from work home," Ms Cameron said. "Now I'm definitely taking the bus."