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PA
Three people have been arrested on suspicion of murder after a teenage boy was stabbed to death in west London.
The 17-year-old victim was found with multiple stab wounds to the chest in Lanfrey Place, West Kensington, on Thursday afternoon.
He was taken to hospital but died soon after. His family has been informed.
The Met said an 18-year-old man and boys aged 17 and 15 had been arrested on suspicion of murder and are in custody at a London police station.
Neighbour Rosie Hayes said she noticed "a group of four guys" near her home who "started calling for help" so she and another person went to assist them where they found the victim.
"They were upset and maybe a little bit aggressive too. There was obviously a bit of an argument going on... they didn't know how to deal with the situation," she said.
Amina Osman, who said she was a family friend, described the 17-year-old as "very kind and handsome".
While laying flowers at the scene, she told reporters this was "the fourth attempt on his life."
Ch Supt Rob Jones said the killing would have a "devastating effect... not only on the victim's loved ones, but also on the wider community".
He added there would be a heightened visible police presence in the area "to prevent any potential further incidents."
The victim is the 6th teenager to be stabbed to death in the capital this year.