The National Investigation Agency on Sunday conducted searches at three places in Kerala in connection with a case pertaining to youth from the state joining ISIS. The agency carried out raids in Kasaragod and Palakkad and interrogated three individuals who are suspected to have links with the youth who joined the dreaded terror organisation. "These persons are suspected to have links with some of the accused persons in the said case who had exited India to join the proscribed terrorist organisation ISIS/Daish," the agency said in a statement, news agency PTI reported. Besides this, the NIA also seized mobile phones, SIM cards, memory cards, pen drives, diaries with handwritten notes in Arabic and Malayalam, DVDs and books of controversial Islamic preacher Zakir Naik, besides untitled DVDs, CDs with religious speeches, books of Syed Kutheb. "Digital devices will be forensically examined and analysed," the agency said, adding the three suspects are being questioned. The case, known as the ISIS Kasaragod Module case, first came to light last year when the NIA busted an ISIS module in Kasaragod and arrested a 25-year-old youth, Habeeb Rahman. Further investigation revealed that a group of 14 people had left India or their workplaces in Middle-East Asia, between mid-May and early July, 2016, to join ISIS.