Yousuf Hakim, sustained 90 per cent burn injuries and was referred to a New Delhi hospital while others were rescued by locals and policemen present at the time of the incident.
The incident occurred at village Bhat Garhi under Kotwali Dehat Police station here last evening.
Mehwish (22), her brother-in-law and other family members were upset as an investigator, who had come to the village to probe a complaint of their neighbour accusing them of vandalising his house, allegedly abused and humiliated them.
Mehwish had eloped with Abdul Hakim in October 2010 and the duo later married. They returned to village in July 2012 but Abdul was killed in November 2012 by four villagers of Bhat Garhi. Mehwish, who was living with her in-laws since her return to village, claimed it to be an honour killing. The police, however, described the matter as an accidental death.
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Enraged at being accused of her husband's murder, she allegedly tried to commit self immolation along with her two minor daughters. Her in-laws too tried to set themselves ablaze. Though Mehwish and others were rescued, Yousuf suffered severe burn injuries.
SP (City) Ajay Sahni said that the matter will be probed and a report submitted within three days.