The NFL announced it will reinforce security tomorrow for all games after terrorist attacks in Paris left hundreds dead and wounded.
Games will be hosted in 13 cities including in California, New Jersey, Maryland and Pennsylvania.
America has been on high alert since extremist stormed Paris on Friday killing and injuring concert-goers, cafe diners and soccer fans in a series of orchestrated shootings and killings.
The NFL is imposing a clear bag policy and urged that fans must bring a bag or keep items in transparent material.
There is no known threat against the stadiums the NFL wrote in a statement noting they had been in communication with the FBI and Department of Homeland Security. Security presence will be increased both inside and outside the stadium, the statement said.