>> didn't have a badge in any way showing. not around his neck, his belt, anything. the police officers that walked later i saw a couple badges on belts, but none were really displayed. >> reporter: police say this is a case of mistaken identity. the commissioner says the plain clothed officers were working a case involving fraudulent credit cards. they say blake fit the description of a suspect. as for the officer who tackled him -- >> use the force was such that i'm comfortable it's in the best interests of the department to place the officer on modified assignment until the investigation moves forward. >> reporter: blake is biracial. the father of the williams sisters is doubtful. >> so many things happen to people of my kind and my color. it's not surprising.