Witnesses to a murder at a bus stop in east London have been urged to contact police.
Svetlana Zolotovska, 40, was found with her throat cut in Stansfield Road, Beckton, at about 0730 BST on Thursday.
Her mother Antonia Belska, 70, was found dead soon after at their home in Leamouth Road, East Ham.
The daughter's estranged husband, who was found in the property with a slashed neck, remains under arrest in hospital on suspicion of murder.
According to police, Ms Belska had been staying with her daughter after arriving in the UK three months ago from Latvia.
Police said Ms Zolotovska was attacked in Stansfield Road, near the junction with Jasper Road, after leaving her home at about 0720 BST.
She was stabbed in the neck, chest and stomach, tests showed.
After making inquiries, officers went to the house in Leamouth Road which was on fire.
London Fire Brigade said the fire, in an upstairs bedroom, was thought to have been started deliberately.
Ms Belska was found on the ground floor. She had been stabbed in the chest and stomach.
Ms Zolotovska's ex-husband, aged 42, was found in the loft.
He was taken to a hospital for treatment to wounds that were thought to be self-inflicted.
Det Ch Insp Phil Rickells added: "This was an horrific attack in broad daylight.
"We know the younger victim left her address in east London at 7.20am to walk to work.
"She was attacked at the bus stop in Stansfield Road. We have traced several witnesses but would like to speak to anyone who may have been in the area at that time."
He said extensive inquiries to trace next of kin and identify the victims were ongoing.