ATHENS, GREECE – The Athens Games (search) are the largest, most expensive anti-terror operation ever in Olympic history — just over $1.2 billion buys what some officials call "a protective shield" over the city.
There are nearly 70,000 Greek soldiers and police guarding every venue from possible terror attacks, including chemical, biological and nuclear response units. NATO is policing the skies and waters around the Greek islands.
This week the minister of public order told FOX News that he has no intelligence warnings of possible attacks by local or international terror groups.
Using a high-tech security blimp, authorities are keeping a close eye on athletes and tourists. The system, which cost over $300 million, was only finally installed and tested three days before the opening of the games.
The U.S. Olympic team has its own security — bomb-sniffing dogs and some armed agents who according to reports could carry weapons inside the Olympic village.
But one U.S. security source protecting American athletes in Athens told FOX News that the Greeks got cold feet on the whole issue of weapons when it became public and that the U.S. security force can carry weapons to protect athletes as they travel to and from venues but not inside the venues themselves.
In the streets of Athens security is present but not overwhelming. Greece is walking a tightrope between reassuring visitors they are safe and not scaring away those who came to see a sporting event — not an Olympic army.
Go to the video link at the top of this story to watch a report by FOX News' Dana Lewis.