The investigation found the footballs were underinflated by 2 pounds per square inch of air less than what’s required by NFL regulations during the Pats’ 45-7 victory over the Indianapolis Colts, according to sources…

Part of the investigation that still needs further vetting is how the 11 footballs became underinflated.

The game balls provided to each team for preparation were required to be inspected and approved by referee Walt Anderson two hours and 15 minutes before kickoff, then returned to a ball attendant.

No alteration of footballs is allowed once they are approved, under league rules and regulations.

The balls are required to be inflated between 12.5 and 13.5 pounds per square inch and weigh between 14 and 15 ounces.