Amid rising fears that the April 29 wedding will be targeted, Scotland Yard and anti-terror chiefs plan to roll out the most rigorous security operation in recent British history.
In response to the recent threats, security chiefs have planned a "ring of steel" around the wedding.
Preparations include responding to a co-ordinated gun and bomb assault similar to the 2008 Mumbai attacks that killed 164 people.
Thousands of uniformed police carrying automatic weapons and Tasers will patrol the million-strong crowd expected to line the wedding route, according to reports.
Snipers will cover rooftops, 35 sniffer dogs will patrol the Abbey area, and an elite SAS team will be on standby to respond to any attacks.
The royal family, VIP guests and foreign dignitaries, including Prime Minister Julia Gillard and Governor-General Quentin Bryce, will travel to the Abbey in armed coaches.
Before entering the church all guests will undergo a nine-point security check, including three at gunpoint.
Royal officials refused to comment on the wedding security operation.
A Scotland Yard spokesman said: "When planning for major events the threat of terrorism is always a consideration. The royal wedding is no exception."
Concerns that chaos might ensue on London's streets were strengthened when the Britain-based group Muslims Against Crusades promised to cause violent disruptions outside Westminster Abbey.
The group's website features a clock counting down to the wedding and images of shattered glass and dead bodies.
Muslims Against Crusades declined to comment but a statement online promised a "forceful demonstration".a royal wedding terror attack was "highly likely" and warned all Muslims to stay away from Westminster Abbey on April 29.
"Maybe when the priest says `is there anyone who objects to this wedding speak now or forever hold your tongue' - who knows what will happen at that time?"Community leaders of England's 2.4 million Muslims said they were disgusted by the threats.
"Those individuals are in the absolute minority. They do not speak for Muslim community," Federation of Muslim Organisation's spokesman Suleman Nagdi MBE said.
Birmingham University's expert on Islamophobia and Muslim issues, Dr Chris Allen, said the threats were "not reflective of the wider Muslim community".
"The attitude towards the royal wedding is one of ambivalence," he said.
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