The mother of the Plymouth gunman, Maxine Davison, and three-year-old Sophie Martyn have been named among the five victims of his shooting spree.
Ms Davison, 51, was shot and killed by her 22-year-old son Jake Davison at her home on Biddick Drive, Plymouth, on Thursday evening.
Davison went on to kill three-year-old Sophie, her father Lee Martyn, 43, Stephen Washington and Kate Shepherd.
His attack lasted about six minutes before he turned the gun on himself.
In online videos Davison spoke of being “beaten down” and “defeated by life”.
All of those who died lived in the Keyham area of Plymouth, Devon and Cornwall Police said.
Officers are continuing to investigate 13 scenes within a cordon that is expected to remain in place throughout much of the weekend.
Having killed his mother, Davison left the property and immediately shot and killed Mr Martyn and his daughter on the street.
Stephen Washington, 59, was also killed, along with Kate Shepherd, 66, who was injured at the scene and died later at Derriford Hospital.
Police said the incident, the worst mass shooting in Britain since 2010, was not terror-related, although Davison made references to “incels” in some online social media videos.
Incels are members of misogynistic online groups of “involuntary celibate” men, who blame women for their sexual failings and who have been linked to a number of violent acts around the world.
Chief Constable of Devon and Cornwall Police, Shaun Sawyer, said Davison was a licensed firearms holder and witnesses described the weapon he used as a “pump action shotgun”.
The force has referred itself to the Independent Office for Police Conduct (IOPC) over the circumstances surrounding Davison’s firearms licence.