According to the Raiders website, longtime owner Al Davis died this morning and "the Raider family will issue a statement later today."
Here's Roger Goodell's statement on Davis's death (via @gregaiello):
"Al Davis's passion for football and his influence on the game were extraordinary. He defined the Raiders and contributed to pro football at every level. The respect he commanded was evident in the way that people listened carefully every time he spoke. He is a true legend of the game whose impact and legacy will forever be part of the NFL."
Al Davis [Raiders.com]
The Al Davis Tribute Thread July 4, 1929 - October 8, 2011 [RaidersFans.net]
Raiders' Al Davis Dies [NBCBayArea]