The NIA has taken over the probe into the seizure of AK-47 rifles and ammunition along with Rs 3,000 crore worth of heroin from a Sri Lankan vessel on March 25. The agency has registered an FIR against six Sri Lankan nationals. NIA sources said the agency will be probing the recovery of rifles and ammunition while the seizure of heroin will be probed by the Narcotics Control Bureau (NCB. “After the seizure of 301kg of heroin from the boat, Ravihansi, NCB had started a probe. They later reported to the state police regarding the recovery of five AK-47 rifles and 1,000 9mm bullets from the boat. Based on this, Kerala Police filed an FIR at Vizhinjam station on April 5. As the case has international ramifications and is of serious nature, NIA decided to take over the probe. An FIR has been submitted at the NIA court in Kochi,” a source said.