Roads by the tube station off of Kingsbury Road were closed to traffic in the aftermath, as was the station itself.
A Metropolitan Police spokesperson told The Sun that police and ambulance services were alerted to the incident at about 9:45 p.m. local time.
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Social media posts show police and ambulances gathering en masse at the scene.
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"They found three people suffering injuries. We await assessment of their condition," police said.
According to The Sun, the shooting comes amid a push for a crackdown on antique guns on the streets of the UK. Local gangs are apparently making their own bullets to carry out violence with firearms that were considered "obsolete" due to a lack of compatible ammunition.
London police have investigated some 91 homicides in 2018.
Earlier on Monday, Sputnik News reported that a man used a hammer to attack two women in Greenwich, southeast London.
In Early August, a "gang-related" knife attack left two people injured and one man dead in Camberwell, south London.
In July, the UK Home Office announced that police firearm operations had increased a whopping 19 percent in the fiscal year that ended in March, with some 18,000 cases in total.
Shortly after beginning their investigation into the Kingsbury Road incident, police said they found it to be "not terror related."