The police said there were some contradictions in the statements of the girl and the victim, and the possibility of self-immolation cannot be ruled out.
On November 23, the police were informed by the GB Hospital authorities that a 19-year-old man has been admitted to the hospital with burn injuries.
The victim told the police that when he was walking with his female friend, a minor, on Kanjhawla Road, three persons came on a motorcycle and allegedly taunted the girl, Deputy Commissioner of Police (Rohini) Rishi Pal said.
The families of the girl and the victim have been staying on different floors of the same house in Nangloi for five years, the police said.
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Both the families, in their statements to the police, said that they were aware about their friendship.
Around 50 letters, many of which written in blood, were found from the bags of the duo. The contents of the letters were found bizarre and some had mention of something he wanted to do to prove his love for the girl, the officer said.