The US believes that Islamist terrorists are developing bombs that could evade existing airport security checks.
While there is not thought to be any specific threat the fear is that Jihadis with Western passports and who have been trained by al-Qaeda, could enter airports armed with bombs that are almost invisible to air travel security measures.
ITV News Diplomatic Correspondent John Ray reports on the new security steps being put in place today:
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Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.