PHOENIX (AP) With millions of people focused on the Super Bowl, federal security officials have again designated the game a "level one" special event, just below the president's State of the Union address.

Police agencies responsible for patrolling the Super Bowl said they're not aware of any threat so far to Sunday's big game, but they've organized a massive buildup of security just in case.

FBI Special Agent John Lewis said Monday that authorities have heard only "what I would call fairly routine, very small incoming complaints about somebody wanting to do this or that.

"That's very typical in these types of cases," he said.

More than 800 officers from numerous city agencies will patrol a 2-square-mile security zone around Glendale's University of Phoenix Stadium, said Glendale Police Lt. Matt Apodaca. He said officers on horseback, on foot and in motorized carts will mingle with fans who are attending the game and the weeklong NFL Experience festival nearby.

The Bureau of Alcohol, Tobacco, Firearms and Explosives will bring Labrador retrievers trained to sniff out compounds that are common among most explosives.

"We bring in our dogs because they are, quite frankly, the best in the federal government," ATF Special Agent Tom Mangan said.

Security officers will be feeding information to a Joint Operations Center in downtown Phoenix. Federal officials, along with representatives of police and fire departments, opened the center this week.

Arizona Department of Public Safety Commander Mike Orose, the liaison between local public safety agencies and the NFL, said the center will help distribute rescue crews in case there is an emergency.

If there is a bomb threat, an ATF response vehicle will be standing by near the stadium to analyze any possible explosive.

Police also have installed security cameras throughout the stadium area. Overhead, U.S. Customs and Border Protection aircraft will circle the sky and give authorities a birds-eye view of what's going on.

Customs will intercept any threat from the air with Blackhawk helicopters and Citation jets based at Davis-Monthan Air Force Base, about 100 miles to the south in Tucson, said Ken Huffer, the Secret Service special agent in charge in Phoenix.

Huffer said federal authorities will enforce a 30-mile no-fly zone around the stadium below 22,000 feet on game day.

The no-fly zone overlaps with Phoenix Sky Harbor International Airport, but Huffer said commercial pilots have been notified and should be able to work around the new security limits.

"I can assure you that there will be no interference with scheduled commercial aircraft," Huffer said.

Security officials say they hope fans won't notice most of their efforts. But people attending the Super Bowl likely will have to deal with more restrictions than they're used to during the regular season.

Super Bowl officials said they will prohibit fans from entering the stadium with anything larger than a small purse or bag. They also won't allow any binocular and camera cases.

Pregame tailgaters also will be forbidden from much of the festivities they're used to.

Fans will be allowed to tailgate near their vehicles with their own food and drinks, but they won't be allowed to have grills. They're also not allowed to park in more than one parking spot or pitch tents in the parking lot.

Orose said authorities started working on security plans for the Super Bowl in November 2006.

They used this year's Fiesta Bowl as a dress rehearsal. "Our planning process, communications, the joint operations center it was really a whole combination of things that we wanted to test out," Orose said.

Orose said a joint operations center will be especially necessary for this year's Super Bowl because of the FBR Open golf tournament and because the Super Bowl events are spread throughout the metro area.

The only comparable sporting event after the Sept. 11, 2001, terrorist attacks was the 2001 World Series in Phoenix, Orose said.

That was a huge event and had a lot of media coverage, but it occurred in just one location, Orose said. "The NFL and the Super Bowl is a weeklong event with a series of activities taking place across the" Phoenix area.