An Ulez sign and camera were also shot down in Harefield, west London.
Public opposition to Ulez led to the formation of an anonymous activist group called the “Blade Runners”, who vowed to take down all of the project’s cameras.
So far more than 380 people have been targeted, with Met Police reporting 185 cables destroyed, 164 cameras stolen and 38 obscured.
It is unclear whether the Blade Runners are responsible for the latest wave of attacks.
This is an official website for drivers to check if their car will be liable for Ulez tax. It encountered technical difficulties due to high demand.
Drivers who fail to pay and are arrested face a penalty of £180, reduced to £90 if paid within 14 days.
The Transport for London (TfL) online tool shows who is liable for this tax.
On Tuesday morning, users were forced to queue as the site seemed overwhelmed. A message read: “Our website is busier than usual. You are now in a queue and your expected wait time is one minute. If you prefer not to wait, please try again later.
Mayor Sadiq Khan resisted pressure from charities, pro-Labour union bosses and even opposition leader Sir Keir Starmer to delay or abandon expansion altogether during the cost of living crisis.
Tory-led councils in Kent, Surrey, Essex, Buckinghamshire, Hertfordshire and Thurrock have all refused to reach an agreement with Mr Khan to allow signs to be erected detailing the charges of Ulez on the border roads of the capital.
Several councils have insisted they will only move if the mayor extends the scrappage scheme to their residents, which helps to cover the cost of purchasing a compliant vehicle.
TfL said nine out of ten cars and around eight out of ten vans seen driving around the outskirts of London on an average day are already compliant.
TfL has been contacted for comment.