"This led to a threat, a new kind of threat,to the West and of course the events that eventually ended with 9-11 and the other acts of terrorism we have seen since then."

VOA: standard.2010.02.11

With the spectre of terrorism surrounding international events, there would be security headaches to endure - and a hefty bill to pay.

BBC: Viewpoint: Could Kenya host the Olympics in 2024?

To James Carafano, a security expert who is vice president of Heritage Foundation, the only way to eliminate the risk of terrorism at major events such as the Boston Marathon is to stop holding them.

CNN: Past bombings prepared response in Boston

The administration's reluctance to clearly label that attack terrorism and comments blaming events initially on a response to an anti-Islamic film ignited partisan bickering and an election-year showdown with Republicans over his administration's handling of the matter.

CNN: Obama has learned tough lessons on using the word 'terror'