According to the police, both the assailants, identified as Kamal, a motor mechanic and his associate Manpreet have been arrested.
The victims hail from Ukhrul district of Manipur. The 24-year-old-woman is pursuing B. Ed from Delhi University.
The incident took place at around 10 PM last night in Vijay Nagar area which is close to Delhi University's north campus when the boy was going to drop her cousin sister to her PG after having dinner at his place.
"They first ignored him but as he continued and went on to call them 'chinki' 'and nepali', the boy confronted him. Kamal and Manpreet, who were in an inebriated state, thrashed the boy black and blue, when the girl tried to intervene, they beat her, tore her dress and molested her and even tried to rape her in front of her brother," said a friend of the duo.
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As they shouted for help, locals and neighbours rushed to the spot after which they fled from the spot. Police was informed and both the victims were taken to a nearby hospital. They were later discharged after first aid and medical examination.
"We have registered a case under relevant sections and both the accused have been arrested," said a senior police official.