Just days after apologizing for a racist joke he made five years ago, Justin Bieber is under fire again for making another offensive wisecrack about black people and using the N-word. 

Over the weekend, TMZ released a video in which Bieber, then 15, asks, "Why are black people afraid of chainsaws?" while answering his own question with the N-word, though someone on camera warns him not to go there. The singer, who is now 20, apologized in a statement released to the Associated Press.

"I'm very sorry," Bieber said. "I take all my friendships with people of all cultures very seriously and I apologize for offending or hurting anyone with my childish and inexcusable behavior."

But now, a new video has reportedly emerged, and Bieber sings about killing a “N-word,” and joining the terrorist, white supremacist Ku Klux Klan. 

In the latest 24-second video viewed by British tabloid The Sun, Bieber changes the words of his 2009 song, “One Less Lonely Girl,” which was written by Usher, his mentor, who is African-American, to “One Less Lonely N----.”

He also mentions the KKK. It is unclear when the video was made, but a source tells The Sun, “Unfortunately this is the devastating reality of how Justin has behaved and reveals his attitude toward such a deeply emotive subject. People need to see this. Normal kids in society do not make these kind of jokes. He is protected by a network of staff, but the camera doesn’t lie. This is the real Justin.”

Bieber has not yet commented on the latest video.