MORE than 5,000 police, FBI and Homeland Security agents supported by F-15 fighter jets and Black Hawk helicopters overhead will enforce a ring of steel around tonight s Superbowl.
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TIGHT: Armed police stand guard during Denver Broncos pre-Superbowl practise this week
Four thousand security guards have also been hired to monitor the 75,000 fans cheering on the Denver Broncos and Carolina Panthers American football teams in Santa Clara, California.
The anti-terror operation is the biggest of its kind on US soil.
Police chief Greg Suhr said he was acutely aware November s suicide attackers in Paris included a jihadi who blew himself up near the Stade de France during a football match between France and Germany.
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DEPLOYED: Security services will have military issue Black Hawk helicopters patrolling
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STAR STUDDED: Chris Martin’s Coldplay are set to play the high-profile half-time show
Islamist killers have also struck in California in recent months.
Husband and wife Syed Farook and Tashfeen Malik murdered 14 people in San Bernardino.
Mr Suhr said: The events that happened in Paris and San Bernardino illustrate how quickly threats have been escalating in an uncertain world .
We have to be prepared for any eventuality and I believe we are.
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NO CHANCES: Homeland security agents will also be able to call on F-15 fighter jets for backup
A no-fly zone around the stadium will be strictly enforced, apart from choppers ferrying celebrity guests to the big game.
It will be opened with Lady Gaga singing the national anthem.
Chris Martin and his band Coldplay are the headline half-time act and will perform in front of an estimated TV audience of 190million.
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