Amid fears the April 29 royal wedding could be targeted by dissident Irish republicans, Al Qaeda or other groups, anti-terror chiefs are planning their most rigorous security operation to date.
Guests at Prince William and Kate Middleton's wedding might go through nine separate security checks as fear of terror attacks amounts with the big day coming closer, reports the Daily Express.
Police also fear the Prince and his bride could be a target for anarchist groups following the attack on the car ferrying Prince Charles and the Duchess of Cornwall in December.
VIPs from across the globe will be asked to arrive three hours before the wedding at Westminster Abbey and the checks they face will include three at gunpoint.
They will also be briefed on what to do if a bomb goes off or there is a Mumbai-style machine-gun attack.
Royal Household officials have divided the 1,900 guests into small groups that will meet at 8am at hotels and other points dotted around central London.
Mobile phones and cameras will be banned. Guests have been told they will have to deposit them, sign paperwork and go through metal detectors before travelling to the 11am service in a fleet of buses.
Anyone using a hearing aid or with any medical complaint has been asked to detail the information in a series of forms that have to be signed.
Roads near Westminster Abbey will be closed to traffic from dawn on the day and thousands of uniformed police will marshal an expected one million-strong crowd lining the route.
They will be supported by police snipers on rooftops, a team of 35 sniffer dogs, and an SAS team held in reserve for any serious incident.
