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>>Nope. There are 15,000 people in the security force here. That includes soldiers, police, FBI, Secret Service, and who knows what other groups. In total there are 60 agencies working on security.
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>That's good. I am in favor of that. But, was there really some on top of the hill? If yes, why do you think they are up there?

I have no doubt there were on top of a hill. They're probably making sure everything is safe. It would be easy for a sniper with a high powered rifle to sit on top of a mountain and pick off athletes or spectators.