This WashTimes article has more information, no registration required.
http://washingtontimes.com/national/20041120-113709-8651r.htm
Here's a snippet:
The president's lead agent approached the line of men as quickly as it closed and demanded to be allowed through. Within a few seconds, the confrontation began to escalate with voices being raised and shoving in all directions.
"You're not stopping me! You're not stopping me!" yelled the agent, as captured by several television cameras. "I'm with the president."
During the fracas, another Secret Service agent was roughly pulled from the tumult and pushed against a concrete wall by Chilean security.
Holy cow!
That article was very informative, and I am now going to get a roll of duct tape to attach my tinfoil hat. Thank you very much.
There's something rotten in Chile.