Kakinada, July 21 (ANI): Three visually impaired students were beaten up mercilessly by their school correspondent for being "ïndisciplined" in Kakinada district of Andhra Pradesh. The bizarre incident took place on Friday and came to light only on Monday when some unidentified persons brought up the video clippings. Angry parents of the children and social activists staged protests in front of the Greenfields School for the Blind over the same. A case has been registered and investigation is on.