At least some of the injuries were caused by "air mail," objects thrown down at cops from rooftops, police at the scene in Bedford-Stuyvesant told The Post.
By early Sunday, eight people had been arrested on charges of disorderly conduct.
The violence came after a series of water dousing attacks on NYPD officers throughout the city this summer.
"Straight up cowards!" one man in the crowd there shouted at cops at just after midnight. "You don’t know how to do anything you f‐g coward!"One of the cops injured Saturday night had to be hoisted onto a gurney by medics, who rushed him from the sidewalk outside Marcy Houses at around 11:10 p.m.