AGRA, Oct. 7 -- A magistrate enquiry has been ordered and an FIR lodged against the man running a Sanskrit gurukul in Vrindavan after four students died inside a 12-foot-deep underground water tank on Tuesday night, allegedly after entering it to clean the tank following a foul smell from the stored water.

Mathura district magistrate Chandra Prakash Singh said on Wednesday that the enquiry would be conducted by the city magistrate. "Various other aspects related to conduct of the institute, including its registration, affiliation etc, are to be probed by the committee," he said.

Singh said the tank was 12 feet deep and added that the presence of poisonous gas may have caused the deaths.

Mathura SSP Shlok Kumar said an FIR was lodged at...