Cops Investigating Junior Hockey Player Over Violent Ref Punch

Cops tell TMZ Sports they are investigating the junior hockey player who violently punched a referee during a game in Massachusetts on Sunday.

A spokesperson for the Foxborough Police Dept. confirmed on Tuesday that cops were called to the Foxborough Sports Center at around 2:22 PM on Sunday after a member of the South Shore Kings had unloaded a right hand into the face of a ref in the middle of a game.

Cops tell us they have yet to determine if there is a "criminal element" ... but did say they are aware of the video of the punch and are currently interviewing all of the involved parties.

"At this time no further information will be released," the spokesperson said, "as it is still under…