UNDATED — The NFL says its investigation into whether the New England Patriots used under-inflated footballs in the AFC championship game is ongoing following a report Tuesday night that claimed the league found 11 balls were not properly inflated.

ESPN cited anonymous league sources saying 11 of the Patriots' 12 allotted game footballs were under-inflated by two pounds. The network did not say how that occurred. League executive vice president for football operations and former Patriot Troy Vincent told The Associated Press that the investigation is underway, adding that the NFL is still awaiting findings.

Patriots quarterback Tom Brady says the investigation is the least of his worries. And tight end Rob Gronkowski tweeted a photo of himself spiking the ball with the words: "WARNING GRONKING MAY CAUSE DEFLATION."

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