Sources said that the agencies has received reports that lower LTTE cadres could be among those currently being held in high security camps for screening.
Sri Lankan military action against LTTE men has made thousands of Tamil civilians flee from the war zone. Indian coastal states like Tamil Nadu, Kerala and Karnataka have been on high alert since Sri Lankan army started the final assault against Tamil tigers.
Intelligence sources also said that India is on high alert since the whereabouts of certain key LTTE leaders like Pottu Amman is still not known.
A senior ministry official said that the home ministry has received reports of LTTE cadres making their way into the refugee camps. He also said, "All refugees are being screened and we are keeping any suspicious people in high security camps. The rest are being sent to open camps."
The Intelligence agencies has advised Congress chief Sonia Gandhi and her son Rahul Gandhi not to travel to Tamil Nadu as it may cause threat to them. The Navy, Coast Guard and troops in the southern command are asked to be on high alert to prevent LTTE from entering India.