Police say they have made 34 arrests relating to the Queen's death already as the biggest security operation in history continues.
At least 10,000 officers, supported by almost every force across the country, will be in central London on Monday as the monarch is laid to rest.
A 'ring of steel' around Westminster Abbey will ensure nothing is left to chance as details have been revealed about arrests already made in relation to the sovereign's death.
The Met's DAC Stuart Cundy is in charge of the operation and expects more than a million people to lining the streets of the capital.
He says the force will use 'all tools and tactics available' with world leaders and VIPs due to arrive this weekend as 22 miles of barriers are used to control the crowds.
"This will be the largest single policing event that the Met Police has ever undertaken," he said.
"As a single event this is larger than the 2012 Olympics, it is larger than the Platinum Jubilee weekend. The range of officers, police staff and all those supporting the operation is truly immense."
Police will be on red alert following the stabbing of two officers in the West End.
It reinforced that the Met must be prepared for a major incident and added: "Who knows what might occur over the coming days.
"If anyone sees anything, hears anything, or thinks that something is out of the ordinary please speak to one of the hundreds if not thousands of officers that they'll see so we can respond accordingly."
DAC Cundy told MailOnline that there had been 34 arrests in London linked to the Queen's death and events, but insisted none were protesters.
Earlier this week, mourners planning to attend the Queen's funeral have been told to be constantly on their guard for potential terrorists who would seem "blatantly out of place" and uninterested.
Former counter-terrorism police chief Nick Aldworth, who was the national co-ordinator until 2019, said it is vital well-wishers be extra vigilant on Monday.
He advised members of the public to instantly report anyone who appears more interested in what the police are doing and are acting secretively.
"We are looking for people who are blatantly out of place," Mr Aldworth said.
"The ones who really aren't paying any attention to what's going on, they are not interested in the ceremonial events. They might be overly observing police officers or cameras.
"They will be potentially acting furtively. We all know when somebody's out of place. Those are the people that the public need to be reporting.
"The police are calling for the public to be vigilant. That's not a bland cliche, there's a long history of terrorism and crime being disrupted by public observation."
