So far as I have seen it is just the one cop that was arrested. Here's a video from fox news that was posted 6 minutes ago:
This is all I know.
The talking head in the video praised the DA for acting quickly but I'll tell you, I think they acted super slow on all this. Normally I'm a "wait for the investigation" type of a guy, but when it's on video...I feel like he should've been arrested about 5 minutes after the DA saw that video.