The video that photographers shoot on the sidelines for use on Web sites and scoreboards is not the same as the game film that is used by coaches to prepare for opponents.  A similar incident happened when the Patriots played in Green Bay last year, according to the Packers’ director of public relations, Jeff Blumb. A member of the Packers’ security team spotted a person on the field carrying a video camera who was wearing an official Patriots credential — those are usually given to members of a team’s staff — but not wearing the colored vests given to photographers.  The Packers asked the Patriots employee to put away his camera. After some initial resistance, he complied, Blumb said. The employee stayed on the field, taking still pictures, Blumb said.  “As to what he was doing, I couldn’t say,” Blumb said.  Blumb said the Packers did not seize his videotape, and nothing came of the incident. The Packers and the Patriots rarely play each other and there would be little competitive advantage to be gained if the Patriots stole the Packers’ signals.  The Jets are not likely to let a similar matter go as quickly, though, because the teams are fierce division rivals, and the relationship between Jets Coach Eric Mangini and Patriots Coach Bill Belichick has grown frostier since Mangini became the Jets’ coach last year.  A version of this article appears in print on , on Page D3 of the New York edition with the headline: The Patriots Are Suspected Of Spying Against the Jets. Order Reprints| Today's Paper|Subscribe
The N.F.L. is investigating whether the Patriots broke league rules prohibiting taping an opponent’s signals on the sideline.