PRESS ASSOCIATION -- Two teenage girls remained in hospital and a third was discharged after all three were gunned down in the street.
Scotland Yard said two of the victims, aged 19 and 18, were in a stable condition, while a 17-year-old girl was discharged from hospital.
Detectives hunting for a gunman were understood to be investigating if Thursday's attack was a botched drive-by hit. It was initially believed that only one shot was fired.
Scotland Yard said the teenagers were taken to hospital after the incident outside a property in John Fearon Walk, North Kensington, west London. One was initially critical, but her condition improved. An investigation is being led by Trident detectives, who deal with gang crime in the black community. No arrests have yet been made, police said.
A police spokesman said officers were alerted by the ambulance service at 7.17pm by members of the public. The victims - who had been out on the street after scorching temperatures throughout the day - received treatment at a central London hospital.
A London Ambulance Service spokeswoman said the 18-year old was treated for gunshot wounds at the scene.
"She was taken to hospital as a priority, escorted by the air ambulance doctor," she said. "Two further patients reported to be female teenagers with gunshot wounds made their own way to hospital."
As a hunt for the teenagers' attackers was launched, police urged witnesses to come forward.
Karen Buck, MP for Westminster North, expressed her concern as she visited the troubled Mozart Estate where the attack took place.
The Labour politician, who has previously called for crackdowns on knife and gun crime, tweeted: "On Mozart Estate after reports of 3 girls being shot. Desperately worried about local gang and youth violence. We have to get a grip."