Two people familiar with the situation tell The Associated Press nearly 500 employees at NFL headquarters in New York turned over phone and email records to investigators looking into how commissioner Roger Goodell and staff pursued the Ray Rice case.
The people spoke to the AP Tuesday on condition of anonymity because details of the investigation won't be made public until later this month.
That's when former FBI director Robert Mueller III is expected to release his report, one of the sources says.
Mueller has been investigating whether anyone at the NFL saw video of the former Baltimore Ravens running back striking his then-fiancee inside a casino elevator before the video was published online.
The sources say league employees were instructed to cooperate with Mueller's team of investigators and respond immediately to requests for information.