There was no infiltration by any member of the banned militant organisation LTTE in central Tamil Nadu as the state police has been maintaining a strict vigil, Inspector General of Police M S Jaffar Sait said on Monday.

Talking to newpersons he said in the aftermath of the recent seizure of iron balls and explosive materials at various places in the state, meant for smuggling to Sri Lanka, the police have stepped up the vigil, particularly along the coastal districts coming under the central zone.

The police have put in place a three-tier vigil mechanism across the zone, namely deployment of 14 numbers at check posts in the coastal districts, patrolling in coordination with Village Volunteers Committee and regular enumeration of Sri Lankan nationals living in the districts, he said.

Patrolling was being done by two companies of Coastal Security personnel, in coordination with 250 police personnel belonging to the state police, all along the coastal regions of Thanjavur, Nagapattinam and Tiruvarur in the Zone, he said.

He said the Village Volunteer Committee was also consistently monitoring any possible entry of Sri Lankan nationals into the region and the state police was making regular enumeration of the Lanka nationals, both in the refugee camps and outside the camps.

To a question, he said 9,016 Sri Lankan refugees, including adults and children belonging to 2,516 families were lodged in eight refugee camps in the zone. Besides 3,170 Sri Lankan Tamils belonging to 999 families were residing at various places in the zone.

Special police teams were regularly visiting the camps to detect any new 'intruders', he added.