The Anti-Narcotics Task Force (ANTF), in a joint operation with the BSF, arrested two alleged drug smugglers and recovered 19.820 kg of heroin that had been airdropped by a Pakistani drone, officials said today.AIG, ANTF, Gurinderbir Singh said acting on a tip-off, a trap was laid near Border Outpost (BOP) Pachharian, where the accused — Baljinder Singh alias Rocky (23) and Manjeet Singh alias Gagandeep (20), both residents of Langeana village in the Sadar area — were arrested.The AIG said the two were allegedly operating as part of the local supply and distribution chain of a cross-border drug-smuggling network.The heroin was concealed in a rubber tube measuring around four feet in length and tightly secured at both ends with iron pipes about 2.5 mm thick. The tube had been airdropped by a drone, officials said.Sources said the drone, suspected to be a large one, flew around 4 km inside Indian territory before dropping the consignment, which was later retrieved by the accused.The accused have been booked under the NDPS Act, the AIG said.