ENGLEWOOD, Colo. -- Denver Broncos?linebacker Brandon Marshall says it was extremely concerning to receive a letter filled with racial slurs and threatening language.Just so many racist, derogatory terms that were in it ... just a bunch of crazy things that was in it, Marshall said Friday. Thats what stood out to me, that somebody would have that much hate or malice toward me or put that much energy into writing something like that and send it to me. It takes so much energy to hate. I just dont understand it.Marshall posted photos of the handwritten letter -- which includes multiple threats and racial epithets -- on his Instagram account Friday. The writer told Marshall your time is coming, watch out, and we are channeling a devastating hard hit for you. Something to make you an invalid in a wheel chair.The letter was sent with a return address of Mrs. Jacksons sixth-grade class at?Martin Luther King Middle School, and We love you, Mr. Marshall was written on the envelope. Marshall called that a cover to make sure he received the letter.My first reaction was, I was taken aback, actually, Marshall said. I had to read it over again. Did somebody really say this to me?It said, Youre a great player, so I had a smile on my face, and then not. And Im like, whoa. I actually let Shane [Ray] read it after I read it. ... Disgusting, disheartening, deplorable -- you can use a bunch of words for it.The Broncos security staff is investigating the letter.Im not afraid. I turned it over to team security, and well see what happens, Marshall said. Its not going to spook me. Its not going to make me move any different than Ive moved. Its definitely eye-opening.Coach Gary Kubiak said after practice Friday that the organization is on top of it.Marshall responded to the letter in his Instagram post, saying, The hatred by some against people of color is one of the reasons we are where were at in the world today, and they wonder why we feel the way we do and take the stances that we take. I received this letter at work.He said he has received an outpouring of support on Instagram since making his post.I just wanted to show that ... to expose that racism still does exist, Marshall said. A lot of people think, Oh, its over; its not out there, but it really is.I wanted to expose that and that there are people like that and we still have a long way to go as people. I wanted to expose that people still hate each other ... whether its because of your belief system or the color of your skin or just because Im not like you, youre not like me.Marshall took a knee during the national anthem before the Broncos first eight games this season as a response to social injustice, including several shootings of black people by police nationwide. He met with Denvers police chief and has donated money for every tackle he has made this season to organizations that work with youth.He said in November that he intended to stand for the anthem for the remainder of the season but would keep working for positive change.The letter is the second known instance of an NFL player being targeted with racial abuse this week. On Tuesday, New York Giants fullback Nikita Whitlock reported a break-in during which burglars drew a swastika and KKK, as well as the word Trump, on walls inside his home. 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Lucic scored on a power play at 15:46 of the third period, when he tipped a shot over Stars goalie Kari Lehtonen for a 3-1 lead. HOUSTON -- His eyes on Las Vegas, Raiders owner Mark Davis says he hasnt shut the door on anything. Oakland, though, might have shut the door on itself as home for his team.Oakland was in the drivers seat if they couldve put together anything, Davis said Wednesday at the NFLs fall meetings, after updating his fellow owners on his desire to relocate to the gambling capital. They came up with nothing.Las Vegas has already done what it is supposed to do and we have to bring it up to the National Football League and get permission to move to Las Vegas.Nevada lawmakers approved a deal last week that increases hotel taxes in the Las Vegas area to raise $750 million for a stadium and more than $400 million to expand and upgrade the Las Vegas Convention Center. Billionaire casino owner Sheldon Adelson is putting $650 million toward the project, while the Raiders and the NFL will kick in $500 million.Commissioner Roger Goodell also said the NFL is looking into establishing a developmental league; re-examining the rules for on-field player celebrations; and reopening the labor agreement. He said the league is monitoring declining TV ratings, too.Several owners insisted its far too early to reach any conclusions in the Raiders relocation issue, and none of them wanted to touch the relationship an NFL team might have with a casino mogul.Goodell supported Davis assertion there has been no movement toward keeping the franchise in the Bay Area, saying we have been working to see if there are alternatives and we dont have one in Oakland.If Oakland is going to be successful in offering the Raiders and the NFL a viable alternative to moving to Las Vegas, I have to stay clearheaded, said Oakland Mayor Libby Schaaf. I cannot afford for us to be thrown off our game because Nevada lawmakers have deemed it appropriate to put $750 million in public money towards a private sports facility. While Im committed to keeping the Raiders, I will not enter into a bidding war with Nevada using public funds.Any relocation needs approval from three-fourths of the 32 NFL owners. Theres also the potential for the Raiders to join the Rams in Los Angeles, where a new facility is being built; they would have that option should the Chargers, who have the first option, remain in San Diego, a decision that team must make by mid-January.But those scenarios also have the possibility of being put on hold -- the Chargers could request a delay, something the owners also would need to vote on.Davis also said he believes having a new stadium ready in Las Vegas by 2019 would be really quick. He acknowledged the Raiders could play a preseason game as soon as next summer in the existing Sam Boyd Stadium, but that facility isnt anywhere near up to NFL standards for regular-season games.Besides, Davis plans to play the next two years in Oakland because the team has a lease with two one-year options there. He cited stability for the players and front office, insisting he doesnt envision a scorched earth policy from the fans.Houston Texans owner Robert McNair noted he was impressed with all the work done in Las Veegas at this point to get the Raiders.ddddddddddddIm pleased theyve made as much progress as they have, he said. Well look at it when it is finally presented in total. These things are still so fluid until they nail everything down we dont know what were looking at. Well wait until we have a full package.Goodell also reaffirmed the leagues longstanding opposition to legalized gambling on sporting events.There clearly has been a society shift as far as how people view gambling, he said. We are still very much opposed to legalized gambling on sports. We think that has an impact on the integrity of our game.Also:- As part of its 2020 Plan, Goodell said hes particularly interested in creating a developmental league. The NFL has not had one since NFL Europe went out of business in 2007, leaving only the CFL and some indoor leagues as places to nurture prospects.Weve talked about it, and ... that is something we might want to do, Goodell said. Teams pick up 300 to 400 players on average from the beginning of the season to the end. Having them ready to play would be helpful.- Recognizing that many fans disagree with the strict rules about player celebrations, Goodell said that the powerful competition committee looks into that topic every year.It comes to balancing a lot of issues and keeping the professional standards we want to hold. Its part of being a professional.- While praising the labor agreement with the union that extends into early 2021, Goodell said the league frequently has spoken with the NFL Players Association about various aspects of the CBA and how to improve it. We believe that ultimately would be a good thing and weve shared ideas with the union.Were seeing what we structured five years ago working very well for all parties. Its leading to a safer game. We think its leading to more long-term investments in the communities and stadiums ... and it has obviously led to increases in compensation, Goodell added.I think we are aware of the basic issues and we look forward to (negotiating) at the appropriate time.- Asked about declining TV ratings, Goodell mentioned that two of the lowest-rated games were up against presidential debates. He also took note of fragmented audiences that are an issue throughout television, and added he doesnt see player protests during the national anthem as a factor in diminished ratings.NFL TV ratings have dropped in every presidential election year since 1996. They are down 15 percent so far in 2016, though not all of that can be attributed to counter-programming. Those ratings went down 6 percent in 1996, 10 percent in 2000, 2 percent in 2004 and in 2008, and 4 percent in 2012, according to NFL Network.I dont think there is a single reason for it, Goodell said. We look at all those factors. Everyone has theories.There are a lot of factors to be considered. We dont make excuses. We try to look at whats causing it and make changes.---AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL ' ' '