UPDATE - CHRIS BROWN, I AM NOT HOMOPHOBIC - APOLOGIZES
Chris Brown tells TMZ he's sorry for going off on Raz B yesterday on Twitter, and making crass sexual references that many say were homophobic.

Brown tells TMZ, "Yesterday was an unfortunate lack in judgment sparked by public Twitter attacks from Raz B, who was bent on getting attention. Words cannot begin to express how sorry and frustrated I am over what transpired publicly on Twitter."

Brown goes on, "I have learned over the past few years to not condone or represent acts of violence against anyone. Molestation and victims of such acts are not to be taken lightly; and for my comments I apologize -- from the bottom of my heart."

One source connected with Brown wanted to make one thing clear -- the notion that Raz B really was molested is highly questionable, given his video denial of the incident (above) -- not that it excuses Brown's comments.

Brown ends his apology with this: "I love all of my fans, gay and straight. I have friends from all walks of life and I am committed, with God's help, to continue becoming a better person." See video.

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So much for anger management ... Chris Brown just unloaded an offensive, scathing Twitter attack on a former member of the R&B group B2K ... and it had to do with comments about Rihanna.

Brown got into it with singer Raz B -- after Raz tweeted Brown, "Im just sittin here Thinking how can ngas like [Eric Benet] and [Chris Brown] disrespect women as Intelligent as Halle Berry, Rihanna."

Brown immediately lashed back -- writing, "nga you want attention! Grow up n**ga!!! Dick in da booty ass lil boy."

Brown is clearly referring to allegations Raz had made a while back -- in which he clamis he was molested by his band's male manager.

Brown continued his attack -- and then tried to explain himself ... tweeting, "I'm not homophobic! He's just disrespectful!!!"

As we previously reported, Brown had recently posted a photo of his diploma from his court-ordered anger management program.

Brown is still on probation for another couple of years.

Chris Brown -- Death Threat in Raz B Twitter Feud

Chris Brown's Twitter feud with former B2K singer Raz B took a violent turn last night -- when Raz's brother posted a video threatening to put a "mother f**king pistol" in Brown's mouth.

The threat came after a scathing exchange between Brown and Raz yesterday afternoon -- which erupted when Raz made comments about Brown's attack on Rihanna.

But after Brown retaliated with several racial and gay slurs directed at Raz -- the B2K singer's brother stepped in ... posting a video message saying, "If I see you in L.A. my dude, I'm gonna put my mother fuing pistol in your mouth."

Raz's brother, Ricky Romance -- who's also a singer -- added, "Step your game up homeboy ... when I see you my nga, I will smack you in the mouth, beat you, drag you down the street and treat you like a little bch my nga. This ain't no mother f**king game homeboy. You ain't welcome in L.A. and if I catch you alone, watch what I'ma do to you."

Last night, Brown twittered a response, "Ill be in LA REAL SOON!!!!!!"