Katihar District Magistrate (DM) Lalan Ji said the incident happened at Nauranga village under Azamnagar police station and the deceased have been identified as Sarthi Kumari (11), Bharti Kumari (13) - both daughters of one Dukhai Chaudhary of the village and Aarti Kumari (11), daughter of Manoj Chaudhary.
The DM said the girls and the injured woman were taking bath in the village pond and were about to come out when lightening struck them. The injured woman, Julie Devi, has been admitted to a government hospital.