Three persons had been arrested in connection with the incident, the police said today.
The incident took place at Hingna village three days ago when a mob threw acid in the eyes of Munna Thakur and Kanhaiya Thakur following a clash between two groups, acting superintendent of police (SP) Manoj Kumar said.
The injured were admitted to the Sadar hospital first and later referred to the Patna Medical College and Hospital, he said.