Police today said a constable attached to Maniyachi station in Tuticorin District received the call on Saturday, with the caller, purportedly speaking from Sri Lanka, claiming that 32 terrorists had sneaked into the state.
Sri Lankan officials have been asked to trace the call, police said, adding security has been further tightened in coastal areas, including Chennai, Tuticorin, Mandapam and Nagapattinam.
Police said patrolling has been intensified by the Coast Guard and Coastal Security Group wing of state police and surveillance mounted in and around such areas. Vehicle screening has been intensified and check-posts alerted.
People in coastal hamlets have been asked to inform police about any suspicious activity or strangers in their areas.
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Official sources said the Vice-Admiral, during the 45-minute long meeting, gave suggestions for foolproof security in the Palk Strait.
Rameswaram is under tight security with vehicular movement stopped around the famous Lord Ramanathaswamy temple, thronged by pilgrims from across the country.
Police detained a person from Andhra Pradesh at Pisasu Munai(Ghost Point) near Rameswaram for questioning.
"Q" branch Police said that they found "enormous contact numbers" in 32 year-old Gopi's mobile phone and that he also made contradictory replies during questioning which created further suspicion about him.