The Police Special Task Force is on the trail of 12 Sinhalese men, in the Eastern Province, who are believed to have become informants of the LTTE, STF intelligence sources said.
Among them some Sinhalese married to Tamil women in the areas bordering the LTTE held territory.
Saman, the person who had been arrested in the Colombo bound train with two claymore bombs on Sunday was one such informant, sources said.
Sources said these persons had been employed by the LTTE to build bunkers for their cadres as well as to gather information about the STF and other government security posts and personnel.
They also said some of these men had worked as double agents, working for both the Wanni LTTE and Karuna Amman?s group for pecuniary considerations but their Tamil wives had been an influencing factor in their activities.
The STF and the security forces have stepped up their surveillance and security in the Karathivu, Akkairapattu and Kalmunai areas following the disclosures made about the activities of these `double agents`, sources added.
Meanwhile, two more Wanni LTTE cadres had been killed in the Welikanda police area in an attack by the Karuna breakaway faction yesterday police said.
Four other persons were injured in an attack in the Senapura area when they had gone to the jungle to gather firewood and among the injured, who were admitted to the Polonnaruwa hospital, was a child.