Those arrested are Surender Singh, 36, and Balwinder Singh, 53, Nigerian Michael Chinedu Chukwudi, 36, and Tanzania's Catherine Leonard Mrope, 26, the police said.
"Balwinder and Surender, both residents of Kapurthala in Punjab, were arrested on July 30 from west Delhi's Rohini Jail area when they arrived there to supply heroin to their contacts," Deputy Commissioner of Police (Special Cell) Sanjeev Kumar Yadav said.
"We seized two kg heroin from Balwinder and one kg heroin from Surender," the officer said.
Both were supplying drugs in Punjab and Delhi-National Capital Region, the police officer said.
According to police, Balwinder was earlier arrested in 2007 and 2015 in separate cases related to the NDPS (Narcotic Drugs and Psychotropic Substances) Act.
"During interrogation, they accepted receiving three kg heroin from the African nationals," Yadav said. "They revealed that the drug dealers had taken on rent two-three flats in Pochanpur and one house in Sector-38 of Gurgaon, Haryana, where they used to keep heroin."
"Chukwudi was arrested from his rented house in Gurgaon and one kg heroin seized from him," Yadav said. The police also seized two passports of Chukwudi, one issued in Nigeria and the other in South Africa.
"He confessed to supplying drugs to Balwinder and Surender for the last six months and that he used to get heroin from another Nigerian resident here," Yadav said.
Chukwudi also allegedly admitted to forging the South African passport after the expiry of his Nigerian travel document.
Catherine was arrested from another flat and two fake passports seized from her flat -- one issued in Tanzania and the other in South Africa, the police said.
"She was illegally staying in India for over two years," the DCP said.
The police said contacts of Chukwudi's friends in Pakistan and Afghanistan sent heroin to him through couriers.
A case under Sections 21 and 29 of the NDPS Act has been registered against the accused, police said.
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