NBC Sports and the Arena Football League said they have failed to reach an agreement to extend their broadcasting contract.

NBC Sports in September will begin airing National Football League games on Sunday nights.

The AFL will begin broadcast discussions with other organizations. The league had a cable deal with OLN last season.

“NBC has been a great partner,” said AFL Commissioner David Baker. “We are forever grateful to them for exhibiting our game with the utmost respect and integrity. We wish them well, but are also excited to begin a new chapter that will continue our unprecedented growth.”

Ken Schanzer, president of NBC Sports, said: “Unfortunately, we were unable to reach an agreement. We’ve enjoyed our partnership with the Arena Football League. It’s a great game with great people. We wish them all the best.”