A team of Special Cell of the Delhi police acting on a tip off caught Ravi Shankar (50) and Vikas (30) near Sherawala Gurudwara on Outer Ring Road, on December 27, said PS Kushwah, DCP (Special Cell).
"Two Kg heroin was recovered from Shankar and 1 Kg from Vikas. Further 500 gram heroin was recovered from Shankar's house in Hoshiarpur (Punjab)," he said.
The drug is estimated to have a value of Rs 15 crore in the international market, the officer said.
Both the accused, residents of Hoshiarpur, revealed during interrogation that they received heroin from persons of African-origin residing in the area of New Mahavir Nagar, he said.
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"Supplier of Heroin in this case has been identified. He was introduced to Shankar by a fellow Nigerian woman, who is lodged in Kapurthala Jail, where Shankar was also undergoing imprisonment," the officer said.
They further told the police that couriers from neighbouring countries used to bring heroin through capusles filled with the drug, by swallowing it.
The Delhi-based African origin persons also used to send consignments of heroin to countries in Europe, Africa and other parts of the world, Kushwah said.
Accused Shankar is a "notorious drug supplier" of Punjab. He has been found previously arrested in more than 18 cases of boot-legging and drug-trafficking in Punjab, he said.
He is also convicted in three cases of the NDPS Act. In two cases, he was convicted for 10 years rigorous imprisonment with fine in each case registered at Hoshiarpur. In the third case, he was convicted for imprisonment already undergone, added the officer.