Scotland Yard
Both victims suffered "multiple injuries", a post-mortem examination found.
She was a mother of three, Scotland Yard said.
But not curbing climate change will cost trillions in the long run.
Detectives say it could take a week to identify the clothed bodies.
Each of the charges relate to four separate individuals.
Thirty-six homicide investigations have been launched in the capital this year.
Police believe there may be more victims, and are urging anyone with information to come forward.
Four people have been arrested.
Four people were attacked from behind in an apparent knifing spree.
The victim, aged in her 40s, had sustained a stab wound to her back after being attacked by a man.