Geeta Aulakh, a receptionist at Britain's biggest Asian radio station Sunrise Radio, died shortly after being found on Monday evening, Nov 16, by a horrified passerby, lying on a street in the west London neighbourhood of Greenford.
28-year-old Aulakh, had a head wound and her hand was severed from her arm, police said on Tuesday, Nov 17.
According to British media, Aulakh's husband, from whom she was separated, was among six people who were arrested. British police do not name suspects until they are charged.
Investigators believe Aulakh was attacked shortly after leaving work to pick up her two children, aged eight and nine.
The local media said Aulakh was born in Britain, while her estranged husband was born in Punjab. The couple had been separated for a year and she had custody of their two sons.
Chief inspector Andy Chalmers said, "When the victim was found we know that a lot of people were in the street and that several people may have tried to administer first aid before the police or ambulance arrived."
"These people left the scene before speaking to police and I would ask that anyone who was there, or anyone else who has information about the incident, call us in the strictest of confidence."