With this, six persons, including five juvenile, have been arrested in the case.
"Four juveniles were detained in this connection yesterday itself. Today a youth, identified as Deva (19) and a juvenile were nabbed in the morning from South Delhi area," said a police official.
The six people, who were allegedly involved in the attack on the youth, identified as Khupgensian, have told police that they did not know him and had attacked him only to rob him, police said.
Senior police officials have been claiming that it is a case of robbery and the attack was not racially motivated.
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The incident had taken place at around 4 am yesterday when the youth was returning to his Paryavaran Complex home after attending prayers at a nearby church.
When Khupgensian resisted, they stabbed him and fled with his mobile phone and wallet. Following the incident, he reached his room after which room partner, along with some other persons, took him to Saket City hospital. Hospital authorities then informed the police.
The incident comes days after two youths from Manipur were allegedly beaten with sticks in Ambedkar Nagar area of south Delhi on Sunday night.
Nido Tania, a youth from Arunachal Pradesh, recently died after he was allegedly assaulted by some shopkeepers in Lajpat Nagar area. A 14-year-old Manipuri girl was raped in south Delhi's Munirka area last week.