The children - aged between six and 17 years - had come to Delhi from Nepal and Bihar. Police said they were ostensibly going to a school in Gujarat.
Refusing to divulge details, police said: "The children will be produced before the child welfare committee. We are also trying to contact their parents."
It was not immediately clear whether any adults were accompanying the children and whether any action was taken against them.
Photos: Sunny Deol with sons Karan and Rajvir at Mumbai airport
In pictures: A look at Anil Kumble's illustrious cricket career
Photos: Karisma Kapoor, Preity Zinta, Shraddha Kapoor at Mumbai airport
Spotted: Anushka Sharma and Diljit Dosanjh at Mumbai studio
Photos: Mallika Sherawat at a restaurant in Bandra