A burnt-out blue van found abandoned the day after two young men were stabbed to death in north London has been linked to the killings.
Sadiq Mohamed, 20 and Abdikarim Hassan, 17, died after being found separately in Camden borough with stab wounds within hours of each other on Tuesday evening.
A 16-year-old boy was also stabbed and is “lucky to still be alive”, the Met Police said at a briefing on Friday. He remains in hospital.
Officers discovered the burning Ford Transit van, which they do not believe was stolen, in Fletcher Court on the Ingestre Road estate, the morning after the attacks.
It was “hanging around” in each of the areas when the victims were fatally attacked, the force said.
The Met has linked the three incidents due to their “proximity in time and locations, the nature of the attacks and developing lines of inquiry”.
It confirmed that detectives were looking into whether any of the attacks were captured on CCTV.
On Thursday evening, an 18-year-old man was arrested at an address in Camden on suspicion of two counts of murder and one of grievous bodily harm (GBH).
Four men in their early 20s arrested on Wednesday in connection with the stabbing of the 16-year-old have been released under investigation.
Officers believe Abdikarim, who died of a stab wound to the chest, was attacked nearby before staggering to Bartholomew Road at around 8.30pm where he was given first aid by members of the public.
Around half an hour earlier, on Aldenham Street, officers came across the injured 16-year-old who they believe was attacked after he and another boy were chased by a group of three men.
They have established that Mr Mohamed was with a friend when the pair were chased by four men down an alleyway before he was stabbed and the group fled.
He was discovered in Malden Road, Camden, at around 10.13pm on Tuesday.
None of the weapons used in the attacks have been found.
Detective Superintendent Stuart Ryan, from the Met’s Homicide and Major Crime Command, would not comment on whether any of the victims or those arrested had links to gangs, or if they were known to the police or each other.
Mr Ryan said the stabbings were not linked “at this stage” to the death of 19-year-old Lewis Blackman, who was knifed in Kensington on Sunday.
Additional reporting by Press Association