Police arrested on Sunday a second man on suspicion of stabbing to death a 26-year-old pregnant woman in south London a day earlier.
The woman, who was identified by the police as Kelly Mary Fauvrelle, was around eight months pregnant. Her baby, delivered at the scene and taken to hospital, remains in a critical condition.
Police said here they made the second arrest, of a 29-year-old man, in the case on Saturday and have kept him in custody.
They had initially arrested a 37-year-old man on suspicion of murder but he has since been released under investigation pending further enquiries.
The motive behind the killing has not yet been established, police said.
Medics fought to save the mother, who is believed to have been about eight months pregnant, after being called at about 03:30 BST.
An air ambulance, two ambulance crews and two response cars were sent to the scene by London Ambulance Service.
A cordon is in place around the whole of Raymead Avenue, Thornton Heath, where the attack happened.
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