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Jon Jones says he's NOT A CHEATER -- and says he still believes he can clear his good name.

Of course, Jon was yanked from UFC 200 after he tested positive for 2 banned estrogen blockers -- which are typically used in tandem with certain performance-enhancing drugs to limit side effects.

He has been temporarily suspended from fighting in Nevada -- and a hearing is expected for later this year.

But Monday afternoon, Jon went to Twitter to plead his innocence.

"Don't write me off just yet, I know in my heart that I'm not a cheater," Jones said.

"I trust in the system to help me prove it."

An axe-wielding madman attacked a German passenger train -- and more than 20 people were injured ... and several could die.

The horrifying scene played out aboard a train outside the city of Wurzburg. The train line was immediately shut down ... and police responded on foot and with helicopters above.

Police reportedly shot and killed the suspect -- a 17-year-old, originally from Afghanistan -- as he was trying to flee from the train.

At least 3 of the victims are battling life threatening injuries.

Metta World Peace's son is a rising star in the high school basketball world -- but he got brought right back down to earth during a Drew League game ... and it was all caught on video.

16-year-old Ron Artest III took the court with some legit ballers in the prestigious L.A. league last week -- and got a real-life experience about what it's like to get dunked on ... hard.

The guy with the ball is Sek Henry -- who started 99 games during his 4 years at Nebraska before playing pro ball overseas. Point is, dude can play.

Artest went up for the block ... it didn't go well.

Don't worry, Ron, it even happens to the greats sometimes ... just ask your dad.

New England Patriots owner Robert Kraft just unloaded on the NFL -- claiming its treatment of Tom Brady has been horrible, unjust and unfair.

Kraft just issued a statement blasting Tom's upcoming 4-game suspension for his role in Deflategate.

"The penalty imposed by the NFL was unprecedented, unjust and unreasonable, especially given that no empirical or direct evidence of any kind showed Tom did anything to violate League rules prior to, during or after the 2015 AFC Championship Game."

He added, "I am most frustrated that Tom was denied his right to a fair and impartial process."

Kraft also took another shot at the investigation -- calling it "flawed and biased from the start" and noting it "has been discredited nearly unanimously by accredited academics and scientists. "

"What Tom has had to endure throughout this 18-month ordeal has been, in my opinion, as far removed from due process as you could ever expect in this country."

"From day one, I have believed in Tom and given him my unwavering support in his pursuit to rightfully clear his name of any wrongdoing. That support extends throughout our organization and has only grown more steadfast as the preponderance of scientific evidence has exonerated Tom. Unfortunately, this stopped being about air pressure a long time ago."

"This entire process has indelibly taken a toll on our organization, our fans and most importantly, Tom Brady."

"His reluctant decision to stop pursuing further action and to put this situation behind him is what he feels is best for the team in preparation for this season and is fully supported by me and our entire organization."

Ronda Rousey just shared some very interesting advice she got from her mom -- "Winning is a bitch. But revenge is a motherf*****."

Ronda was speaking at the Women in Action female empowerment event in Chicago earlier Friday -- when she talked about advice she got from her athlete mom about bouncing back after a loss.

The crowd went wild for Rousey -- who was pretty pumped up!

Does this mean she wants another crack at Holly Holm?

She also said, "I want to win my belt back."

Ray Rice knows the clock is ticking on his NFL comeback ... but says if the window closes, he's ready to move on.

Rice hasn't played a down in the NFL since 2013 -- after the ex-Baltimore Ravens running back attacked his then-fiancee in an elevator in an Atlantic City casino.

The 29-year-old has been training like a maniac in the hopes of getting a second chance -- but no teams have pulled trigger ... and Rice knows his comeback chances get worse every day.

"I know that the window for playing is closing," Rice told NJ Advance Media ... "But if my window closes, I'm going to make sure I open up a thousand more opportunities for kids, to give them an opportunity to pick up where I left off."

Rice says he's still training -- "but I'm more training for life."

"I think it's safe to say that football ... I don't want to ever say I'm giving up, because that's never going to be me ... I'm happy."

"I'm in the best shape of my life, and I know if it doesn't happen this year, it's probably something I have to deal with. But you know what? It's not the end of my life."

We got video of Rice training last year -- he still looks like he's in pretty good shape.

Kanye West and Damon Dash didn't tarnish a Latin singing group's name by promoting murder, violence and drug sales in a movie collaboration ... at least that's what a judge ruled.

TMZ broke the story ... West and Dash were sued last year by a member of Loisaidas, a group that's been around since 2008. Member Michael Medina said the rap duo tarnished Loisaidas' brand after they released a movie in 2015 with the exact same name.

However, a judge disagreed ... and on Thursday dismissed the suit. The reasoning? ... "Loisaidas," which refers to Manhattan's Lower East Side, is fair game considering that's where the film took place and had nothing to do with the singing group.

Pretty bold allegation from Bill Simmons ... who claims the NFL co-opted several ESPN employees to smear Tom Brady's image during the Deflategate saga ... including Stephen A. Smith.

Stephen A. had tweeted about Brady's 4-game suspension on Wednesday -- saying, "Tom Brady was ARROGANT, UPPITY, SELFISH and in the end he brought this on himself."

That's when Simmons -- who famously left ESPN on bad terms -- chimed in about his former colleague.

"One of multiple ESPN employees used by the NFL to leak anti-Brady info during this saga decides to weigh in."

Gonna guess Stephen A. will have some thoughts on this ...

FYI, we reached out to ESPN -- but the network had no comment.

Tom Brady's running out of options ... because a federal appeals court just shot down his request to get a rehearing in the Deflategate case -- meaning it's unlikely he'll get out of serving his 4 game suspension.

Brady had filed a request for a rehearing with the 2nd Circuit Court of Appeals -- but Wednesday, the court formally denied Brady's request.

The New England Patriots QB can still appeal to the U.S. Supreme Court -- but there's no guarantee the court would take the case ... and even if it did, it's unlikely the case would be decided before the 2016 NFL season begins.

Now we know how Kobe Bryant's been keeping himself busy in retirement ...

Vanessa Bryant just announced she's with child -- the couple's 3rd kid -- and it's a girl!

Mrs. Mamba broke the news on social media -- saying, "Beyond blessed and excited to share that we are expecting our third baby girl!!! #Blessed #BabyMamba #Thankful."

It's been a while since Kobe's changed a diaper -- his oldest daughter Natalia is 13 and Gianna is 10.

Congrats!

Pokemon Go creators want players to catch 'em all, but to avoid getting jacked while you're doing it ... they're warning you not to play on your own.

Alleged robbers in Missouri used the GPS location features on the game to lure in unsuspecting gamers -- then pulled guns on them, according to cops. Four suspects were arrested.

The Pokemon Company International and Niantic, Inc tells TMZ it's aware of the incidents while playing the game, and encourage all people playing to "be aware of their surroundings and to play with friends when going to new or unfamiliar places."

For the uninitiated ... Pokemon Go is a mobile app that uses GPS location to encourage players to walk around their immediate surroundings and collect digital creatures.

BTW, in just a few days ... Pokemon Go has added over $7 billion in market value to Nintendo.

NBA superstar Draymond Green was arrested for assault early Sunday morning in East Lansing, Michigan.

Tim Duncan made it official ... he's retiring from the NBA after 19 seasons, all with the San Antonio Spurs.

40-year-old Duncan's leaving the game with a ton of hardware -- 5 NBA rings, a Rookie of the Year award and 2 MVP trophies.

The surefire future Hall of Famer will be replaced by Pau Gasol, who the Spurs signed last week.

Duncan was never the most thrilling player, but he consistently dominated enough to become the 14th highest scorer in NBA history.

One of the greatest moves of his career happened in defeat -- dragging his wasted teammate Aron Baynes out of a Hollywood nightclub. Solid effort, TD!

The body of Craig Morgan's son has been found. The family has released a statement thanking fans for the "outpouring of support."

The 19-year-old son of country star Craig Morgan is missing after an inner tube accident.

Jerry Greer was with friends on the Tennessee River Sunday, when a boat pulling an inner tube got involved in some sort of accident. Greer, the son of Morgan and wife Karen Greer, has not been found.

We're told there were no signs of drinking ... at least not initially. One source called it "a freak accident."

We're also told Greer had some type of flotation device on at the time of the accident.

Dallas Police Chief David Brown just confirmed the obvious ... one of the shooters was gunning to kill white people, and especially cops.

The Chief said the killer was angry over the 2 recent shootings and also upset with the Black Lives Matter movement.

The end of his comments is heart-wrenching, talking about the lack of support police feel everyday.

6:45 AM PT -- Police have ended the lockdown. Cops say an employee had passed through security with an item in a backup that appeared to be a weapon.

Once they determined it was not ... everything went back to normal.

The U.S. Capitol is on lockdown while police search for an individual -- possibly armed -- and people already in the building have been told to take shelter.

According to law enforcement there was a report of a person with a gun in a subway near Capitol. It's unclear if the person has actually entered the Capitol.

Right now authorities are saying the lockdown is being done out of "an abundance of caution."

Story developing ...