The two accused, Darbara Singh alias Billa (48) and his nephew Ajay alias Sandeep Singh (19), were arrested from Uttam Nagar in west Delhi with the police claiming to have seized the heroin, worth Rs 16 crore in international market, from them.
"On May 1, an information was received that the duo would receive huge consignments of heroin. A trap was laid and the accused were nabbed while they were in a car," said Sanjeev Kumar Yadav, DCP (Special Cell).
Three kgs of heroin was seized from Singh, while one from Ajay. An Alto car with a Punjab registration number and three mobile phones have also been seized, he said.
The heroin, that is supplied to these places, is smuggled from Afghanistan and Pakistan, Yadav said.
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The arrested accused were supplied heroin by a man residing in Uttam Nagar.
It emerged that carriers from Afghanistan and Pakistan used to bring heroin in their stomachs by having capsules of heroin, said the officer.
They would then hand over the heroin to suppliers in Delhi which was further supplied to the drug dealers in UP, Punjab and Haryana.
During interrogation, it was revealed that Singh is an associate of one Buta Singh, a Punjab-based drug supplier who is currently lodged in Nabha jail.
Police said Singh was convicted in three cases of the Narcotic Drugs and Psychotropic Substances Act in Punjab and awarded 32 years imprisonment with a fine of Rs 3 lakh.
He was granted parole in 2015 for some days when he absconded.
He went underground and restarted the illegal trade of drug trafficking. For more than one-and-a-half years, he has been receiving supply of heroin from some persons and their woman associate in Delhi, police said.
She is facing trial in other cases and is currently lodged in Ludhiana Jail.
Ajay gets Rs 10,000 per trip to Delhi and has been coming here along with Singh for the last six months, they said.