The CID has been permitted by the court to detain the suspects who were arrested in Puttalam for 90 days and question them.
The CID arrested four suspects during a special operation in the Wanathawilluwa area, in the Puttalam district.
Nearly 100 kg of explosives and 100 detonators were also taken into custody by the Police.
Further investigations are underway to ascertain the background and connections of the suspects.
The CID conducted the raid following information received by them.