Five more teenagers have been injured in stabbings in London as the spate of violent crime in the capital continues.
A boy aged 13 was seriously hurt in an attack in Newham, east London, and another in his late teens suffered stab wounds in Ealing, west London.
Two 15-year-old boys are in serious but stable conditions in hospital after a third incident in Mile End.
A man has been held on suspicion of attempted murder and a boy of 16, who had minor injuries, was also arrested.
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Meanwhile, protesters and community leaders gathered at Hackney Central station, east London, to call for an end to the recent bloodshed.
It comes after London Mayor Sadiq Khan denied that police had “lost control of crime in London” in the wake of more than 50 murders in the capital this year.
On Wednesday, 18-year-old Israel Ogunsola was stabbed to death in Link Street, Hackney.
On Monday, 17-year-old Tanesha Melbourne was shot and killed in Tottenham before 16-year-old Amaan Shakoor, from Leyton, was shot in the face in Walthamstow. He died the following day.
The Metropolitan Police says the condition of the teen stabbed in Ealing Broadway at about 19:00 BST on Thursday is not yet known. He was taken to hospital by ambulance.
The boy who was attacked in Gainsborough Avenue, Newham, at about the same time, is also in hospital.
Police said three youths were arrested on suspicion of grievous bodily harm with intent in connection with that incident.
In Mile End, London Ambulance Service treated three people at the scene in Grove Road at about 18:00.
The two seriously hurt were taken to hospital but the 16-year-old was arrested on suspicion of conspiracy to commit grievous bodily harm after receiving treatment for minor wounds.
At the Hackney protest, people huddled round the station entrance before locking fists in a wide circle in solidarity for those killed.
Protest organisers Guiding A New Generation – commonly known as G.A.N.G – asked people to share their stories and plead for an end to the killings over a megaphone.
Activist Boogz, 40, said: “We are trying to guide these children to let them know that their life is not going in the right direction.
“I want to say to them this is not the life.
“All the music that you listen to which glorifies this kind of thing, all the money that they see, all the cars that they see people driving, they are being sold a lie, they are being sold a false narrative – and we are here to change that narrative for them.”
Four hours before Mr Ogunsola was stabbed, Hackney police were also called to a bookmakers on Upper Clapton Road.
There were reports of an unconscious man following an altercation.
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Medical staff tried to help the victim, aged 53, but he was pronounced dead at the scene.
A man has been arrested and will be interviewed by murder detectives from City of London Police, who have stepped in due to the “current demand” on the Met’s Homicide and Major Crime Command (HMCC).
There was also a fatal stabbing of a suspected burglar on Wednesday in Hither Green, south-east London, and, on Thursday, a man in his mid-20s was stabbed in Walthamstow. His injuries are not considered to be life-threatening.