Three people have been arrested and a minor has been detained after a 23-year-old photographer Ankit Saxena was killed allegedly by the family of his Muslim girlfriend in west Delhi. Ankit was attacked on a street near his home on Thursday night and his throat was slashed, the police said. They have arrested the mother, father and uncle of Ankit's girlfriend and have detained her 16-year-old brother, who too was allegedly involved in the murder.