The adults were identified as Arjun, 20, and Raju alias Chhakka, 24, police said. The name of the juvenile was not given as he cannot be named as per law.
“Both the accused and the juvenile are vagabonds,” a police officer said.
Arjun was arrested from Jamuna Bazar area in north Delhi while Raju was arrested from Paharganj area in central Delhi.
The officer said a hunt is on for two more people involved in the rape.
Earlier, two men were arrested — Mohd Raja, 22, hailing from Fatehpur in Uttar Pradesh and Mahendra alias Ganja, 25, belonging to Maharashtra. They have been sent to police custody till Jan 20.
On Thursday, a third person, Raju alias Bajji, 25, was arrested.
The Danish woman was robbed and raped at knife-point by eight vagabonds near New Delhi Railway Station Tuesday.