Giants alerted NFL that Steelers used deflated balls (The Associated Press)

The NFL says no formal complaint was filed last week by the New York Giants, who reportedly alerted the league that the Pittsburgh Steelers were using deflated footballs during their game. Fox reported Sunday that after the Giants forced two turnovers during their 24-14 loss last Sunday , they tested the footballs on their sideline. After both of the footballs tested below the NFL standards for PSI, according to the report, the Giants sent them to the league office.
Source: Yahoo.com