A teenager has been arrested on suspicion of attempted murder after a two-year-old boy and three adults were shot in north-west London. The child, his mother, who is in her late 20s, and two men in their late teens were taken to hospital with gunshot wounds following the incident in Harlesden on Wednesday night. Scotland Yard arrested a 19-year-old man in an early-morning raid in north London on Friday. The force said the three adult victims, who are believed to have been known to each other, were approached by a lone gunman in Energen Close, Harlesden. He fired multiple shots at the two teenagers, hitting them, the mother and her two-year-old son, who was in a nearby car, before fleeing the scene on a motorbike. The child is in a serious but stable condition in hospital. The adults’ injuries were described as not life-threatening or life-changing. DCI Rick Sewart, of the Metropolitan police, said: “As a result of this terrible crime, an innocent two-year-old-boy is now seriously ill in hospital. This child was shot in a wanton act of indiscriminate violence. “I know that people will be shocked and horrified that a little boy should be the victim of a gunman and I need the community to show their support for him, and his family, by telling police what they know. Anyone giving information will be fully supported and if you don’t want to give your name, you can call Crimestoppers, which is totally anonymous. “But however you want to do it, make that call, and anyone who is doubtful should think of that little boy and his family’s anguish.” A local resident said he thought he had heard five gunshots minutes before police arrived. Another claimed the victims had previously lost a relative in a shooting.