Three Dalit sisters were attacked with acid while they were asleep inside their residence in Uttar Pradesh’s Gonda district, the police said on Tuesday. The minor girls have been admitted to a hospital and are currently stable, police officials said. The incident happened in the early hours of Tuesday while they were sleeping on the terrace. An FIR has been registered against unknown persons. The family members told police that all the three sisters came running downstairs, crying in pain in the mid of the night. The girls’ parents recently fixed the marriage of their eldest daughter, a high school passout. She received the maximum burn injuries out of the three girls.