Homegrown militants are increasingly carrying out fidayeen attacks on security personnel.
A few pamphlets of Popular Front of India and Social Democratic Party of India, both under the scanner of security agencies, have also been seized from the houses and workplaces of the accused persons
The cabinet of ministers approved a proposal by the acting justice minister, which will also see offenders fined one million rupees (USD 5,715), the government said in a statement.
The Muslim politicians also protested what they term the government's inability to ensure the safety of their community which constitute 9 per cent of the island's 21 million population.
The attacker struck in the eastern Yakatot neighbourhood, where US and NATO forces maintain complexes as well as facilities operated by the Afghan National Security Forces.
The two-member team is in the Sri-Lankan capital to find out any possible links between the terrorist modules and the terrorists involved in the deadly Easter Sunday bombings in Sri-Lanka.
Military forces and police armed with assault rifles are patrolling the streets leading to churches and standing guard outside the compounds.
Sri Lankan radicals who had pledged allegiance to the Islamic State group have been blamed for the April 21 bombings against three Christian churches and three luxury hotels.
Muhammed Faizal Hameed aka Abu Marwan Al Hindi, said to be holed up in Qatar, is part of the 4-member IS module which planned suicide strikes in the state.
The move was taken after police recovered a large haul of weapons, including swords, during searches of mosques following the Easter Sunday's suicide attacks, which claimed 250 lives.
Similarly, the NIA, which retrieved Telegram chats of an IS module busted in north Kerala, found Istishhadi was frequently discussed among the group members.
Riyas was radicalised by following jihadi videos and literature after 2014.
The incident occurred at Naykkatti near Sultan Bathery in Wayanad on Friday afternoon.
Multiple blasts rattled eastern Afghanistan’s Jalalabad early on Wednesday killing employees of the Afghan construction company EBE and a military intelligence officer.
Five encounters have taken place since February 14 - three in south Kashmir and two in north Kashmir - and 12 security personnel were killed.