Downing Street and the White House regard a real and present danger is a terrorist attack during President George Bushs state visit to London this week.
Hundreds of thousands of anti-war protesters are expected to demonstrate in London and across the country against Bush. Prime Minister Tony Blair admitted this week that the visit has serious problems in terms of security.
We are examining the possibility of a suicide bomber using a biological weapon, confirmed a senior member of the American security task force that has arrived in London.
Experts in countering biological warfare from Porton Down, Britains bio-warfare defence establishment on Salisbury Plain, will be in London. They will be stationed at the Ministry of Defence during the Bush visit.
GCHQ, Britains invisible eye in the sky at Cheltenham will focus its thousands of computers and listening devices to pick up a whisper in the wind of any threat to the President.
At Menwith Hill in the north of England, where Americas National Security Agency has its European facility, ECHELON, NSAs most sensitive and still ultra-secret surveillance system will be specially programmed to keep track of any threat to Bush.
The global electronic network is of truly astounding proportions. It links
satellites to a series of high-speed parallel computers.
The system enables every electronic communication in the world to be intercepted in real time.
Searching for key words, ECHELON can identify and segregate 500,000 messages of interest a SECOND.
By the end of the week, hundreds of US secret service men, FBI agents and anti-terrorist teams from the CIA will be in London.
Joining them will be every available officer from MI5 and MI6. All police leave has been cancelled. Surveillance will be intensified on all suspected Islamic Fundamentalists.
With them will come CIA chief, George Tenet, and FBI director, Robert Muller,
who will accompany the President.
Both plan to pay special attention to the activities of Abu Hamza al-Masri. The one-eyed cleric spreads his extreme Islamic Fundamentalism outside the Finsbury Park mosque in north London which he is barred from entering.
The American intelligence chiefs will repeat again their demands that Hamza
should be extradited to the United States to face terrorist charges.
The issue is likely to be discussed in talks between Prime Minister Tony Blair and Bush.
Documents discovered in Denver, Colorado, on how to poison a citys water
supply have been traced back to the Sheikh by the FBI.
But the threat to Bush has triggered a turf war between Britains security services and the platoons of Americans.
MI5 and the Special Branch feel there is a danger that the Washington security policy of you do it OUR way is counter-productive.
They point to the fact that the FBI want to conduct a finger tip search of the Presidents suite in Buckingham Palace where he will stay during his three day visit.
If the Queen went to stay in the White House, we wouldnt expect
to run a metal detector over her guest suite, said an MI5 source.
This coming weekend, the US security team will check the ancient sewers under Whitehall where a terrorist could place a bomb. The sewers serve Buckingham Palace where the President and Mrs Bush will stay.
After the search, all manhole covers will be sealed as they are in all American cities prior to a Presidential visit.
Security men will also first check all the food the President will be served.
The plate containing his own meal will be selected at the last moment
from several identical plates before it is served to the President, confirmed
a US security man.
Original plans for the President to ride in a horse drawn coach down the Mall to Buckingham Palace have been scrapped.
Instead, Bushs custom-made limousine will take him everywhere in public.
The cars defences have added 2,000 pounds to its original weight. An armoured internal partition and windshield have been integrated into the body shell. The doors and roof are similarly protected.
The titanium-ceramic armour has been tested to withstand a 155 millimetre shell airbursting overhead, or a five pound mine detonating under the chassis. All the windows are proofed against 50-calibre armour piercing bullets.
Built into the passenger compartment is an oxygen mask and fire suppression
system, a global positioning indicator accurate to within one foot and a jam-resistant
miniature communications switchboard which can connect the President to the
Pentagon or the White House.
A touch button facility can also link him to Air Force One. Programmed into the switchboard for his London visit will be all the key security numbers he will need plus the Queens direct line.
In the event of the limousines tyres being shot out, the car is able
to maintain a speed of 60 mph on the steel rims of its wheels.
The CIA trained chauffeur has passed the most demanding driving course in the world. By his right knee, within instant reach, is a compartment containing a pump action shotgun.
Short of driving in a tank, the President is the most protected person
in public on earth, Secretary of Defence Donald Rumsfeld has said.
His personal phalanx of bodyguards have been given special Home Office permission to carry hand guns at all times. Usually, the protection detail of a foreign dignitary must check in their guns on arrival in Britain.