Matthew Mills, a 30-year-old independent journalist from Brooklyn, managed to use an old media pass from a festival to hop aboard an employee bus and get past multiple security screenings at the MetLife Stadium before the game.

"I just said I was running late for work and I had to get in there. It was that simple," Mills told the New Jersey News.

"I didn't think that I'd get that far. I just kept getting closer and closer. Once I got past the final gate and into the stadium, I was dumbfounded."

Once the Seattle Seahawks clinched victory, Mills walked straight into the media tent with the other reporters for the post-game news conference with players and coaches.

It was during questions with Seattle player Malcolm Smith, that Mills, who is affiliated with advocacy group WeAreChange and proclaims to be a “9/11 truther”, decided to try and send a message.

In the news footage that was being broadcast live, Mills is seen grabbing the microphone from Smith, who in turn looks for help from managers.

“Investigate 9/11. 9/11 was perpetrated by people in our own government,” Mills said.

The interruption lasted about four seconds before Mills was promptly pushed off the stage by publicists.

Smith, who had just been voted the Super Bowl's Most Valuable Player, echoed what many were thinking. “Let's check his press pass,” the linebacker joked.

Mills was later arrested and state police said he was being charged with criminal trespass, the New York Times reported.

"I just saw my opportunity to get my word out there and I took it," Mills said.

The National Football League (NFL) said they were looking into the matter.

However, the incident has left many wondering how Mills was able to gatecrash the media tent so successfully.

It is estimated the Super Bowl cost New Jersey taxpayers more than $US17.7 million ($20.1 million), although the exact costs for security is unknown.

The operation involved some 4000 guards, sniffer dogs, helicopters, about 700 New Jersey State Police troopers and security teams from the FBI, state transit police, Department of Homeland Security and NYPD, Asbury Park Press reported.

All spectators were shuffled through security screen tents and scanned with metal detectors before entering the stadium and were restricted to bringing in a clutch bag and a small, clear plastic bag.

More than 6000 journalists registered with the NFL to cover the Super Bowl, the New York Times reported.

Each media organisation was required to submit credential applications in November and each individual had to present a government issued photo ID in order to pick up their own media passes.

Despite the strict accreditation process though, Mills was able to bypass all of the above with a fake pass that simply looked liked the others.