The National Investigation Agency filed a chargesheet in a case pertaining to a conspiracy hatched by ISIS members for propagation of the ideology of the proscribed terrorist organisation
Trump did not identify the person or give more detail on how he was killed.
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.
The raids which began in the morning were still underway, they said.
NIA had sought 15-day custodial interrogation of the accused who were arrested from various parts of the national capital and Uttar Pradesh