An Imperial County water agency director was arrested as police investigate a video posted online that appears to show him hitting his stepson.

The video shows a man playing a game of catch with a boy. The boy drops the ball, and that's when the man, identified by authorities as Anthony Sanchez, begins whipping him with a belt.

Neighbor Oscar Lopez shot the video Wednesday morning from inside his home. After a minute, Lopez can be heard on the recording telling Sanchez to stop.