India has lodged a protest with the United States government after several Indian students were detained there in connection with their enrolment in a fake university, following an undercover operation.

Indian news reports say as many as 129 Indians were among those detained on January 30 by US immigration, promoting a rare “démarche” to the United States Embassy in New Delhi, telling it that Indian officials needed immediate consular access to the detainees.

The Indian Ministry of External Affairs said in a statement it has been in contact with US officials and has expressed concern for the detained students.

The ministry urged the US to release them and cautioned that some "may have been duped".