The late Queen Elizabeth IIs funeral is the UK's most extensive security operation recently.

The late Queen Elizabeth II will remain in good memories; many will attend the funeral service; the expected number of people is measured in hundreds of thousands. Aside from ordinary citizens, the world's elite will come to Westminster Hall to pay respect on Monday. Sky News and other global news reports that the guest list comprises King Charles III, Prince Andrew, Prince Harry, Prince William, and over 500 royalty, heads of state, prime ministers, and other world leaders around the globe.

Consequently, the burial ceremony entails security risks. It is a huge security challenge for the host (British security and intelligence services) and guests (foreign dignitary protection specialists escorting their Principals) to maintain a secure environment and keep all VIPs safe. The last time central London has seen such a large and complex security operation is London 2012 Olympics.

As London Mayor Sadiq Khan told to Associated Press, such a significant number of world leaders in one place is an excellent opportunity for criminals, terrorists, and other bad guys. Therefore, British security, police, and intelligence agencies must put a colossal accent on identifying, assessing, and mitigating potential threats, which requires a lot of work and resources. For instance, local news reports that London bobbies are expected to engage over ten thousand police officers; also, the military will be on standby.

As expected, each VIP will come with a close protection team; for example, President Biden will be escorted by a Secret Service protective detail to Westminster Abbey. Interestingly, 400 special security agents will look after the US president, making him the most protected person at this high-profile event. Likewise, SO14 Royalty Protection Group, Metropolitan Police Service (MPS) component, will look after Britain's Royal Family. Metropolitan Police Deputy Assistant Commissioner Stuart Cundy says this security operation, codename operation London bridge, exceeds London Olympics.

Some preventive steps include sealing sewer grates, searching trash containers, a no-fly zone for drones in central London, and many grounded flights at Heathrow Airport. Assigned security measures involve security personnel such as SCO19 marksmen on rooftops, DSU K-9 units, Marine Policing Unit on the River Thames, and the Metropolitan Police Mounted Branch. On top of that, intelligence agencies, GCHQ and MI5, will coordinate the operation out of the control center near Lambeth Bridge.

World leaders will be transferred in a bus, except president Joe Biden who will be transported in his armored car, the "Beast." The biggest challenge is securing the 20 miles/32 kilometers route (Buckingham Palace—Hyde Park—Windsor Castle, where Queen Elizabeth II will be buried in St Georges Chapel alongside her husband, late Prince Philip).

Police have taken precautionary measures and arrested protesters opposing King Charles III's accession to the throne. Also, police and intelligence services are aware of all potential troublemakers and wannabe attackers, including jihadists, and keep an eye on them. According to Dean of Westminster David Hoyle, a priest who will perform the ceremony, security measures are tight, and police officers thoroughly check every vehicle and person.

Police will employ layered protection to secure Queen Elizabeth II's funeral with support from military and intelligence agencies. Apart from visible police officers and personnel in military uniform, many police and security forces will operate covertly and blend into the crowd gathering along the way of the funeral procession in central London.