MUMBAI, Jan. 5 -- During its crackdown on drug-trafficking networks in 2025, the Mumbai zonal unit of the Narcotics Control Bureau (NCB) seized 5,560 kg of narcotic drugs and psychotropic substances, including 11.76 kilogram of Cocaine and 49.66 kilogram of Mephedrone. Proceeds of assets worth Rs.18 crore emanating from sale of narcotic substances were also frozen last year. The agency arrested 51 accused while probing 24 cases registered under the NDPS act last year, agency officials said. Describing its enforcement actions during 2025 as "significant", the officials said that the NCB has focussed on dismantling of entire networks engaged in narcotic trafficking. NCB busted a network allegedly involved in international trafficking of cocaine, sourcing the narcotic from suppliers based in USA. In January this year, NCB's Mumbai unit had intercepted three persons in Navi Mumbai and subsequently seized multiple types of drugs allegedly from their possession, which was meant for sale in Navi Mumbai. The agency later in May secured the deportation of the network's kingpin from Malaysia. The agency also acted against a Dongri-based alleged drug syndicate, having links to organised crime, which dealt in trafficking of mephedrone. The agency also assisted via a joint operation with the state police and Rajasthan police that led to the busting of a clandestine, illegal laboratory in Raigad. In another operation against an inter-state trafficking network, the NCB seized tablets of the illegally-diverted pharmaceutical drug Alprazolam. The agency arrested the syndicate's female kingpin and her associates who diverted the drug from Varanasi, Uttar Pradesh....