The police had been alerted by a resident, who had come across the explosives while preparing his land for farming.
Three mortar rounds, one R.P.G round and a landmine were found by the police.
Omanthai police said that these explosives would be detonated by the STF bomb disposal squad today (03) on the orders of the Vavuniya magistrate.
Further investigations are underway.
(Pics : Madhava Kulasooriya - Vavuniya correspondent)