National Security Advisor M K Narayanan on Monday said the Centre was 'careful' about the activities of Liberation Tigers of Tamil Eelam.

Emerging from a 30 minute meeting with Tamil Nadu Chief Minister M Karunanidhi, he said, "We are always careful about LTTEs activities in Tamil Nadu or anywhere else in India."

He said a strict round-the-clock vigil was being maintained all along the coastline.

The National Security Advisor was responding to questions about reports of increased LTTE activities in the state.

Asked whether they was any move for joint patrolling between the Indian and Sri Lankan navies in the Indian ocean, he said there was only coordinated patrolling, wherein both navies were patrolling in their respective areas.

Narayanan said Tamil Nadu had dealt with the Naxal problem much better than other states.

"I think Tamil Nadu has dealt with the Naxalite problem much better than most other states. We have the National Development Council meeting and the Chief Ministers' conference on Internal Security. The prime minister wanted me to come and brief the chief minister on some issues that will come up at the meeting as he is participating," he said.