Two cops were injured yesterday while arresting three unruly swimmers at McCarren Park Pool in Brooklyn — the second violent outbreak there since it reopened last Thursday.

A 20-year-old hood punched a cop in the face and was busted for assault police said. His two pals, 17 and 18, were cuffed for disorderly conduct, cops said.

The punched officer and his partner, who suffered a wrist injury, were treated at Bellevue Hospital.

On Friday, the pool was closed after lifeguards were attacked by a vicious pack of teens.