 Though the party denied any involvement, the charge-sheet filed by National Investigation Agency (NIA) blamed Popular Front of India (PFI) and their political outfit Social Democratic Party of India (SDPI) in conducting arms training camps across the state under the pretense of health awareness camps and yoga classes.According to the FIR, the 24 accused in the case were reportedly the members of the Popular Front of India (PFI) and the Social Democratic Party of India (SDPI).Cases were registered under sections 143, 147, 153(B), R/W 149 of IPC, section 5(1)(a) r/w 25(1)(a) of Arms Act, section 4 of Explosives Act and section 18 of Unlawful Activities (Prevention) Act of the Indian Penal Code.Four SDPI activists were arrested for attack on two Communist Party of India (Marxist)(CPI-M) members at Mangalam, Tirur, on 29 January 2014.