More than 30 vehicles in Wembley were damaged in what police are describing as a "spree of vandalism".
Met police said at least 15 wing mirrors were smashed between 2am and 4.15am on February 6 in the area of Harrow Road, St Andrews Avenue, Medway Gardens and Priory Gardens.
Officers added that although 15 crimes have been officially reported, they believe more than 30 vehicles were affected.
Police, who were alerted by a resident who reported seeing three men attack various vehicles, have released pictures of three suspects they would like to speak to in connection with the attack.
The suspects are described as white males, aged in their late teens or early 20's and of slim build.
One was wearing a dark puffa-style jacket, grey tracksuit bottoms with white vertical stripes and was carrying a black messenger bag.
Anyone with information can call police on 101 or Northwick Park Safer Neighbourhood Team on 020 8721 2969.