The Narcotics Control Bureau (NCB) has taken custody of a Sri Lankan fishing boat and seized 300.323 kg of heroin along with five AK-47 rifles and 1,000 rounds of 9 mm ammunition. In a statement, NCB Zonal Director Chennai Zone Amit Ghawate said on specific intelligence received by Indian Coast Guard and NCB, a Sri Lankan fishing vessel 'Ravihansi' was intercepted by the Coast Guard on March 25 in Indian waters off the coast of Vizhinjam, Kerala. The NCB Chennai Zonal Unit took over the custody of the boat and seized 300.323 kg of heroin along with five AK -47 Rifles and 1,000 rounds of 9mm ammunition. A number of incriminating documents were also seized from the occupants of the vessel, the statement issued here on Wednesday said. The heroin was found concealed inside the water tank of the vessel in 301 packets. Image of a flying horse was found on all the heroin packets, which is a usual practice of drug trafficking syndicates to brand their drugs. (IANS)