An uneasy calm prevailed in Kudankulam today with police tightening vigil as anti-nuclear protesters continued with their relay fast at Idinthakari, epicentre of protests against the Kudankulam Nuclear plant, condemning the action against anti-KNPP activists.

Police here said the situation was calm but they are keeping a strict vigil. "Security has been stepped up," sources said. Sources close to S P Udhayakumar, convener of People's Movement Against Nuclear Energy, spearheading the protest against KNPP, said key leaders including him and Pushparayan, will court arrest by turning up at the Kudankulam Police Station tonight.

The agitation had turned violent yesterday when one person was killed in police firing when protesters tried to attack a police station at Manapad in Tuticorin district.