Fifteen activists of two pro-Sri Lanka [Images]n Tamils outfits have been arrested for attempting to burn the national flags of India and Sri Lanka in Chennai on Saturday.

Activists of the Tamil National Socialist Party and Tamil Nationalist Liberation Movement were arrested when they tried to burn the flags of the two nations in front of Shastri Bhavan, which houses various Central government offices, police said.

The two outfits, in a release, alleged that despite repeated pleas from Tamil Nadu to pressurise Colombo for a ceasefire, the Indian government had not done enough to prevent the 'killings' of Lankan Tamils.

In Erode, four activists of two other pro-Lankan Tamil outfits -- Tamil Desiya Viduthalai Iyakkam and Tamildesa Poduvudamai Katchi -- also have been arrested from near the railway junction for burning national flags of the two countries.

The activists were arrested and partially burnt flags seized from them, police said.