Witnesses say the woman, identified as 44 year old Sandra Amezquita, was trying to protect her 17 year old son from getting arrested.
According to police, they were trying to arrest the teenager because he had a knife and that is when his mother intervened. The video shows an officer grabbing the woman from behind and slamming her to the ground. She landed on her stomach with the officer on top of her.
She is six months pregnant and according to her doctors, she is now having complications.
Update: Lawyers representing Sandra said police also beat the pregnant woman on her stomach with batons, and they released photos showing her bruises.