Four persons were held by the police for attempting to stage a black flag demonstration against Asin in Mettupalayam, when she arrived there for Vijay's 'Kavalan' shooting on Sunday.

The four, owing allegiance to a pro-Eelam outfit, were protesting against the actress for her recent visit to Sri Lanka, despite a curfew, sources said.

The agitators also raised slogans that Asin should not act in Tamil films in future. They alleged that in spite of Tamil film associations had urged its members to boycott Sri Lanka, the actress took part in movie's shoot in the island nation.

"Asin violated the ban imposed by the South Indian Film Actors Association against actors visiting Sri Lanka to act in films and enjoying the company of anti-Tamil Sinhala politicians", they said.