Sadiq Khan ordered a review of security in London today as he declared that the capital stood “united with Nice and France” after the “unspeakable act of terror” on the French city.
Police, City Hall and other security experts will examine if new measures are needed in London following the Nice lorry attack carnage in which at least 84 people were killed.
It is the first murderous incident of this type and scale in western Europe.
Special barriers have already been put up along Whitehall and outside Parliament to stop a lorry-bomb terror strike.
But the review will probe whether more barriers and other security protection are needed in other parts of the capital.
Its findings will feed into the wider terror preparedness review, being headed by Lord Toby Harris of Haringey, which Mr Khan announced on taking office.
The Mayor of London also condemned the “poisonous and twisted ideology” of the Islamic State organisation and other terrorists and stressed they “will not win”.
“My deepest sympathies are with the people of Nice this morning – particularly with those who are injured, and the families and friends of those who were killed,” he said.
“This was a horrific and unspeakable act of terror on a day of celebration and hope for the French people, who have suffered so much pain in recent times.
“Londoners today stand united with Nice and all of France in our grief.”
Both London and Paris have been hit with terror attacks, with 130 being killed in the French capital in November and 52 on July 7 2005 in the British city.
Mr Khan, the first Muslim mayor of a western capital, added: “We are also united in our determination to root out and defeat the sick and evil individuals who have tried to divide us with this cowardly act of terror.
“They will not win. Not in France. Not in London. Not anywhere. We will defeat their poisonous and twisted ideology.”
He also emphasised that he wanted to “reassure” Londoners that City Hall and the Metropolitan Police would be reviewing safety measures in light of the Nice attack.
“I and the Metropolitan Police Commissioner will do everything possible to keep London safe,” he explained.
* Labour leadership contender Owen Smith today cancelled the official launch of his campaign in the wake of the terror strike in France.
“In light of the heartbreaking news from Nice, I am cancelling today’s campaign launch. Solidarité et fraternité avec le peuple Français,” tweeted the Pontypridd MP.