A pregnant woman was killed and her unborn child left critically injured in a knife attack in South London.

The 26-year-old victim, who was about a month from her due date, was found with fatal stab wounds at a home in Thornton Heath at about 3.30am on Saturday.

Paramedics delivered her baby at the scene and took it to hospital, where it remains in critical condition.

Police arrested a 37-year-old man on suspicion of murder following the attack.A 37-year-old man has been arrested on suspicion of murder and is in police custody, with the force stating officers "retain an open mind to any motive".

The Metropolitan Police said: "Police were called by London Ambulance Service (LAS) at 3.30am on Saturday June 29 to reports of a woman in cardiac arrest inside an address at Raymead Ave, Thornton Heath.

"Officers attended along with the LAS and found the woman, aged 26, suffering from stab injuries.