"Four separate teams are on the job, we have detained four persons till now. After completion of questioning, all those who are involved will be taken to court and remanded," a senior Villupuram Range Police official told reporters, adding probe is on.

Superintendent of Police Narendra Nair said cases under several provisions of the IPC and Women Harassment Act are being filed. Asked if a suicide note was recovered, he said, "We will let you know at the appropriate time after the probe is complete."

The suicides that occurred yesterday comes after recent protests by students alleging collection of exorbitant fees by a Yoga and Naturopathy college at Kallakurichi, close to nearby Chinna Salem.

The police said there were also other complaints from students, including of lack of amenities. The deceased girls have been identified as second year students -- V Priyanka, T Monisha and E Saranya.

The girls allegedly tied themselves together with a dupatta and later jumped into a farm well near the college. The bodies were retrieved by police and fire brigade personnel and sent to a government hospital for autopsy.

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