The accused have been identified as Alitumo and Ikechukwu Orji, both presently residing in Delhi, NCB zonal director Kaustubh Sharma said here.
"The two Nigerians were arrested last night while they were travelling in a car near a roundabout here," he said.
Preliminary investigations revealed that the two were involved in cloth business and purchased material from Tamil Nadu and sold it in Delhi, he said.
They were in drug smuggling for the past three years, he said, adding that they were allegedly supplying drugs from Delhi to Chandigarh.