FOXBOROUGH, Mass. — The two men most responsible for delivering wins for the New England Patriots both said Thursday they have no explanation for how footballs used to reach the Super Bowl were underinflated by 2 pounds per square inch. Patriots quarterback Tom Brady said he has not been contacted by the NFL, even as league officials investigate whether the team cheated against the Indianapolis Colts in the AFC championship game. "I don't know what happened," Brady said, answering questions from reporters hours after Patriots coach Bill Belichick said he almost never thinks about football pressure and doesn't know what happened, either.