Fifteen persons, including a police sub-inspector and three home guards, were electrocuted to death and seven were injured after a transformer exploded at the Namami Gange project site on the banks of the Alaknanda river in Uttarakhand’s Chamoli district on Wednesday, The Indian Express reported.

Additional Director General of Police V Murugesan said that an investigation is underway. “Prima facie it appears that there was current on a railing and the investigation will reveal further details,” he added, reported ANI.

Chief Minister Pushkar Singh Dhami said that he has ordered a magisterial-level inquiry into the incident.

“It is a sad incident,” he told ANI. “The district administration, the police, and SDRF [State Disaster Response Force] have reached the spot. Those injured are being referred to a higher centre and some of them are being shifted to AIIMS Rishikesh via helicopter.”