The National Investigation Agency on Saturday arrested an alleged operative of banned Jamaat-ul Mujahideen Bangladesh terror outfit Rezaul Karim, believed to be in charge of transporting explosives to various places in Burdwan in West Bengal.
The probe agency said in a statement that it carried out the searches at the houses of three suspects -- two in Kasaragod and one in Palakkad.
Shah said stringent actions would be taken against any individual who jeopardises the nation's security.
The National Investigation Agency has, in separate incidents, arrested two individuals in connection with the Burdwan blast case. The first arrest was that of Suzena Begum, wife of key accused Sahanur Alam and the second person arrested was Zia-ul-Haque, wanted for indoctrinating youth in sectarian ideology.
The agency said that it could not find any 'strong evidence' against Indresh Kumar, Sadhvi Pragya, Rajendra and Ramesh alias Prince.
A massive manhunt is underway for three foreign terrorists, possibly of the Lashkar-e-Taiba, responsible for the deadly attack on pilgrims in Jammu and Kashmir's Reasi that resulted in the loss of nine lives, including a two-year-old, officials involved in the investigation said on Monday.
National Investigation Agency officials said that Salvinder Singh, his jeweller friend Rajesh Verma and cook Madan Gopal have been summoned for a routine questioning as the agency is preparing to receive a five-member Special Investigation Team from Pakistan on March 27.
NIA had sought 15-day custodial interrogation of the accused who were arrested from various parts of the national capital and Uttar Pradesh.
Four IAF personnel, including a squadron leader, were killed and 22 injured on January 25, 1990, at Rawalpora on the outskirts of Srinagar.