"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 PTI, adding probe is on.
Superintendent of Police Narendra Nair said cases under several provisions of the IPC and Women Harassment Act are being filed.
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.
Police said there were also other complaints from students, including of lack of amenities.
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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.
He alleged that his daughter was victimised by college authorities like the two other girls as they had complained to district authorities over collection of exorbitant fees.
Villupuram district Collector M Lakshmi said the students had alleged that the college had collected exorbitant fees to the tune of several lakhs of Rupees over and above the fee structure determined by the government.
They had also requested for Rs 10 lakh as financial aid to the next of the kin of each victim, the collector said.
Meanwhile, district revenue authorities sealed the college premises. The post-mortem is currently underway.
Pressing for their demands, the college students resorted to a brief road roko on the Tiruchirappalli-Chennai highway.