Three residents of Kasaragod and Palakkad districts are being questioned by the National Investigation Agency (NIA) as part of a probe into ISIS recruitments from Kerala. Incriminating evidence was said to have been recovered during raids at their homes today. The three are believed to have been in touch with some of the people who left the state to join the international terror group. Sources said the probe agency is also trying to establish if they have links with those involved in the April 21 suicide bomb attacks in Sri Lanka.