article_snippet: Robert McCulloch said on Sunday after announcing the arrest.
article_snippet: protesters, but Robert McCulloch said on Williams Williams may have been . shooting at someone else.
article_snippet: St. Louis County Prosecutor Robert McCulloch said St. Louis County Prosecutor Robert McCulloch believed the 20-year-old suspect attended last week's protest before Shooting happened.
article_snippet: St. Louis County Prosecutor Robert McCulloch said there may have been other people in the vehicle with Williams and that the investigation is ongoing.
article_snippet: St. Louis County Prosecutor Robert McCulloch also said tips from the public led to Williams' arrest.
article_snippet: Brittany Ferrell, 26, a protest leader with the group Millennial Activists United, had just left a meeting with other leaders Sunday when word of Williams' arrest circulated.
article_snippet: Ferrell suspected St. Louis County Prosecutor Robert McCulloch tried to cast Williams as a protester to reflect negatively on the movement. '
article_snippet: Above, a Michael Brown supporter .
article_snippet: (Additional reporting by Kate Munsch in Williams, Mary .
article_snippet: Wisniewski and Suzannah Gonzales in Chicago, Brendan O'Brien in .