The incident took place at Mahrail village last night as the assailant Gulam Ansari took out acid from his vehicle and hurled it at five members of a neighbouring family following a dispute between the two sides, Rudrapur police station in-charge Pradeep Kumar said.
The injured persons have been admitted to a Sub-Divisional Hospital at Jhanjharpur, he said.
Ansari has been arrested after one of the acid attack victim Anwar Ansari lodged a case against five persons, including Gulam Ansari, for the attack on his family members, Kumar said.