Anti-Ulez campaigners have taken action once again by putting Sadiq Khan stickers on cameras to block the sensors.
The "blade runner" protesters targeted around 10 cameras within a five-mile radius around Orpington, Bromley and Lewisham in South East London last week.
The vandalism led to five sets of traffic lights out of action, which caused travel chaos for drivers.
Campaigners have now been blamed for a crash in Orpington after damage to the cameras resulted in the traffic lights cutting out.
At the junction of the collision on Court Road and Old Priory Avenue, a damaged car was still at the roadside, while a sticker of Khan's face with the word "liar" written on his forehead had been stuck over the ULEZ camera
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A six-year-old girl and an adult were taken to hospital after two vehicles collided last Thursday.
Both are believed to be in a non-life-threatening condition.
At the junction of the collision on Court Road and Old Priory Avenue, a damaged car was still at the roadside, while a sticker of Khan's face with the word "liar" written on his forehead had been stuck over the ULEZ camera.
Chief Inspector Priya Shome, based in Bromley, said: "We are investigating the criminal damage to five sets of traffic lights in the Orpington area overnight which has caused major traffic management issues.
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"Two police units, who should have been available to answer 999 calls, were instead required to spend the morning managing traffic.
"The people who are carrying out this criminal damage are putting the public at risk.
"There has been a collision between two cars on Court Road, at the location of one of the damaged traffic lights, in which a child was injured.
"I would urge the people carrying out these crimes to stop immediately and think about the danger they are causing to road users."
Ulez vigilante attack leads to traffic chaos with young girl rushed to hospitalFacebookOpponents of the clean air scheme have taken matters into their own hands, cutting down cameras in an effort to thwart Transport for London’s (TFL) attempts to catch incompatible vehicles.
Since the expansion, cameras which now cover the whole of Greater London have been stolen or damaged 1,000 times.