RedactedNarrative: V2 WAS ANCHORED NEAR SEVERAL OTHER VESSELS.  V1 WAS TRAVELLING UPRIVER AND ATTEMPTING TO MANEUVER BETWEEN SEVERAL OTHER VESSELS TO ANCHOR.  WHILE MANUVERING, V1 STRUCK THE BOW AND ANCHOR OR V2.  V1'S OPERATOR THEN CUT V2'S ANCHOR.  V1 THEN LEFT AREA WITHOUT IDENTIFYING THEMSELVES.