"I fully support TfL's decision - it would be wrong if TfL continued to license Uber if there is any way that this could pose a threat to Londoners' safety and security".
Mr. Khan said, "I have every sympathy with Uber drivers and customers affected by this decision but their anger really should be directed at Uber".
Uber Technologies Inc.'s license to operate in London was revoked, a surprise decision that will affect the 3.5 million people and 40,000 drivers who use the app in the city.
Uber won its licence to operate in Liverpool a year ago - but could the U.S. cab hailing app face losing its licence in the city?
Uber's license to operate as a private hire service is set to expire on September 30.
"This ban shows the world that London is far from being open and is closed to innovative companies, who bring choice to consumers and work opportunities to those who need them".
The company pulled out of Austin, Texas, when it was told its drivers would have to undergo fingerprint background checks, but resumed services after the requirement was ended.
More than half a million people signed an online petition in less than 24 hours by Saturday afternoon backing Uber's fight to save its vehicle operations in London, mirroring profound economic and political disagreements in Britain.
Asked if he would contact London officials about the decision, Ross said he would not since he isn't officially involved.
Protesters gather in Barcelona as Catalan referendum dealt a blow
The Madrid government is facing one of Spain's worst political crisis since the end of Francisco Franco's dictatorship. But he was not impressed by the arrests.
"We expect Uber will again embark on a spurious legal challenge against the mayor and TfL, and we will urge the court to uphold this decision".
TfL had said the taxi-hailing app had demonstrated "a lack of corporate responsibility in relation to a number of issues which have potential public safety and security implications".
The company has some 40,000 drivers on its books, but has been the subject of a fierce campaign against the service by traditional black cab drivers, who say they are subject to much tighter rules and regulations.
Transport for London said the conduct of the ride-hailing app, which has around 25,000 drivers operating in the British capital, had raised concerns.
"At the flick of a pen Sadiq Khan is threatening to put 40,000 people out of work and leave 3.5 million users of Uber stranded", Greg Hands, the government minister for London, wrote on Twitter late on Friday.
The GMB union, which represents black cab drivers, said that "other major cities will be looking at this decision and considering Uber's future on their own streets".
"Our pioneering technology has gone further to enhance safety with every trip tracked and recorded by Global Positioning System".
"Uber operates in more than 600 cities around the world, including more than 40 towns and cities here in the United Kingdom", the company said.