The Narcotics Control Bureau has seized 3.98 kg of heroin worth Rs 24 crore from a South African national at the Chhatrapati Shivaji Maharaj International Airport here, an NCB official said.

Acting on specific information, a team of the NCB's Mumbai zone officials on Tuesday apprehended the person, who had come from Johannesburg and was carrying a red trolley bag, he said. During the search, they found a cavity in his bag where four packets of heroin, weighing 3.98 kg, were kept hidden, the NCB said in a statement.