New Delhi, Jan 31 (Agencies): Tamil Nadu Chief Minister M Karunanidhi, on Monday met Prime Minister Manmohan Singh and is said to have raised the issue of Indian fishermen being killed allegedly by the Sri Lankan Navy.

Karunanidhi, who arrived here on a three-day visit met Singh at his residence and is believed to have asked the Prime Minister to tell Colombo not to resort to firing at fishermen who cross the International Maritime Border.

Karunanidhi also discussed the ensuing Assembly polls in Tamil Nadu and the seat-sharing mechanism between the DMK and Congress, DMK sources said.

He is also scheduled to meet Congress chief Sonia Gandhi.

"I have been discussing the fishermen issue with Singh on several occasions," he had said on Sunday indicating that he would take up the issue with the prime minister again.

Meanwhile, Foreign Secretary Nirupama Rao is in Colombo to take up the issue with Sri Lanka.

Rao was asked by External Affairs Minister SM Krishna to travel to Colombo to discuss with the Sri Lankan government the killing of Indian fishermen.