'Soulja Girl' Arrested; Mom Says She's Bipolar

ATLANTA -- "Soulja Girl" is behind bars.MARTA police said Nafiza Ziyad, 25, is the woman caught on video during a profanity-laced tirade on a MARTA train.

Captured by another rider the video of the woman's rant, directed at an elderly MARTA rider, has become an Internet sensation, getting heavy viewing on YouTube.com and other Web video sites.

During the confrontation the young woman refers to herself as "Soulja Girl," repeatedly uses the N-word and threatens an elderly woman.After getting tips identifying the young woman as Ziyad, MARTA police charged her with simple assault and two counts of disorderly conduct.Investigators told WSB-TV Channel 2 reporter Tom Jones they were able to identify the elderly passenger and after speaking with her they arrested Ziyad. Her mother told WSB-TV's Monica Pearson Ziyad is bipolar and was off her medication when the attack took place."I was shocked," said Ziyad's mother, Elaine Sabree. Sabree told Pearson her daughter was off her medication because, "She didn't believe she was bipolar."At first other passengers don't interfere during the minutes-long attack, but finally one man can be heard telling "Soulja Girl" to "chill."