The row over harassment of a woman has turned into a caste fight between the Dalits and members of the Uppara community leading to tension in the belt villages of Kolleru. At least nine persons, two of them with critical head injuries, were undergoing treatment in the government hospital here after a group clash on Sunday night. According to information, an autorickshaw driver of Maheswarapuram, a Dalit, was detained by members of the Uppara community at Gurukulapeta under Madepalli gram panchayat five days ago for allegedly making an indecent gesture to a woman from their caste.