'Words cannot begin to express how sorry and frustrated I am over what transpired publicly on Twitter,' singer says in statement.

Following a heated, homophobic Twitter bout with former B2K singer Raz-B, Chris Brown apologized Thursday.

"Yesterday was an unfortunate lack in judgment sparked by public Twitter attacks from Raz-B, who was bent on getting attention," Brown said in a statement to TMZ. "Words cannot begin to express how sorry and frustrated I am over what transpired publicly on Twitter. I have learned over the past few years to not condone or represent acts of violence against anyone."

On Wednesday, Brown reacted when Raz-B tweeted a comment critical of Brown. "I'm just sittin here thinking how can n---as like [Eric Benet] & [Chris Brown] disrespect women as intelligent as Halle Berry, Rihanna," Raz wrote.

Brown tweeted back, "N---a you want attention! Grow up n---a!!! Di-- in da booty ass lil boy."

Brown added at the time: "I'm not homophobic! He's just disrespectful!!!"

The offending Tweets have been taken down.