It comes as a 17-year-old girl was shot dead in Tottenham last night and another shooting and stabbing incident was reported in Walthamstow.
Paramedics tried to save the Tottenham victim but she was pronounced dead at the scene at around 10.30pm.
Paramedics tried to save him but he was pronounced dead at the scene at 1.55am.
Last night his cousin Billie Shuter said: 'My little cousin was murdered last night, my heart is broken.
[They] have been taken into custody at an East London police station.’ Heartbroken friends and family have left behind touching tributes to a 20-year-old who was knifed to death in a leafy and affluent road just a street away from his home.
The entrance to the Olympic Park is just a few hundred yards from the street.
The Metropolitan Police said yesterday: ‘Detectives are investigating after a teenager was stabbed in Bow.‘Officers administered first aid prior to the arrival of London Ambulance Service.‘The victim, believed to be a 16-year-old boy, was taken by ambulance to an East London hospital.
She added that her relative did not have a bad bone in his body.
A 21-year-old man has been arrested on suspicion of murder and is currently in custody at a west London police station.