The Directorate of Revenue Intelligence (DRI) has seized 3.5 kg of gold dust worth around Rs 5.5 crore at Chhatrapati Shivaji Maharaj International Airport in Mumbai and arrested four people, including two airport staffers and two transit passengers, officials said on Friday.

The seizure was made as part of the agency's ongoing crackdown on the smuggling of precious metals through the country’s major transport hubs.