The NIA has raised serious allegations against the banned PFI and its arrested leaders and claimed that the seized documents during the raids contain highly incriminating materials.
Abdul Sattar, who was allegedly absconding after calling for a state-wide hartal on Sept 23 against nation-wide raids on the PFI's offices and arrests of their leaders, will be handed over to NIA.
Many of the victims of the PFI's attacks are no longer alive, Professor TJ Joseph said, while adding that he would like to observe silence in solidarity with those victims.
The home ministry claimed that PFI and its associates or affiliates or fronts have been involved in violent terrorist activities with an intent to create a reign of terror in the country.
KSRTC contended that the hartal was called without any advance notice which was a violation of the high court's orders that flash hartals were illegal and seven days prior notice has to be given.
CPI leader R Mutharasan, while referring to the recent 'petrol bomb' attacks in the state claimed that the so-called bombs were "plastic bags containing petrol or crude bombs that did not ignite.
Four PFI activists were also arrested from Kerala's Kottayam district and one from Kollam in Kerala for allegedly engaging in violent activities during the state-wide hartal on September 23.
The arrest of 274 detainees was also recorded on the day, taking the number of nabbed PFI workers to 1,295. So far, 308 cases have been registered in connection with the violence.
They are accused of indulging in 'unlawful activities promoting enmity among communities' and 'waging a war against the country'.
The PFI claims to strive for a neo-social movement ostensibly for the empowerment of marginalised sections of India.
The outfit called for a dawn-to-dusk hartal in the state on Friday to mark their strong protest against the raids carried out in their offices.
The official said incriminating materials, including digital devices, documents, two daggers and over Rs 8.31 lakh, were seized during the operation.