Four people have died in the space of just over 24 hours in a series of violent attacks across London.

A heavily pregnant woman was stabbed to death in the small hours of Saturday morning. Her baby is in critical condition after an emergency procedure at the scene of the stabbing in Croydon.

Around 15 hours later, a man was injured during a fight in Coldharbour lane in Brixton, and died hours later. Just after 11pm last night another man was stabbed to death in a street in Newham.

Then, in the small hours of Sunday morning, an 18-year-old died after a stabbing in Southwark.

Another man is critically injured after a stabbing when an out-of-control rave at a north London housing estate turned violent , with riot police deployed to disperse hundreds of people who had gathered at the scene.

London Mayor Sadiq Khan wrote online today: "The City Hall funded Violent Crime Task Force, a specialist force of @MetPoliceUK officers, have made over 5000 arrests, and removed over 1500 dangerous weapons from our streets in the last year."

After the "horrific" killing of pregnant mother Kelly Mary Fauvrelle, 26, in Croydon, Mr Khan said: "Violence against women has no place in our city, and horrific murders in the home like this show the scale of the problem we face.

"My heart goes out to this innocent child, and to the mother they have so tragically lost. @MetPoliceUK are investigating - please help if you can."

The first incident took place in the early hours of Saturday when Ms Fauvrelle, 26, who was eight months' pregnant, was stabbed to death in Thornton Heath, Croydon .

Scotland Yard officers were called to reports of a woman in cardiac arrest at the house just after 3.30am, where they found Kelly Mary with stab injuries.

She died at the scene. Her child was delivered after the stabbing and is said to be in a critical condition today.

Police said a 29-year-old man was arrested on suspicion of murder and remains in police custody.

A 37-year-old man who was also arrested has been released under investigation.

Later that day, just before 6pm, police were called to Coldharbour Lane in Brixton to reports of a fight.

Officers found a 54-year-old man injured at the scene.

He was taken to a south London hospital where he was pronounced dead just after 10pm.

The man has not been formally identified, but his next of kin have been informed. A post-mortem examination will be scheduled in due course.

Two arrests have been made in connection with this incident.

Police also said the Directorate of Professional Standards and the Independent Office for Police Conduct had been notified as the man was arrested prior to being taken to hospital.

Later on Saturday, a man thought be in his late 20s was stabbed to death in a street in east London .

Police were called to the junction of Ron Leighton Way and Wakefield Street, Newham, at 11.07pm where they found the man suffering from stab wounds.

He was pronounced dead at the scene. His next of kin have been notified.

A post-mortem examination and formal identification of the victim will take place in due course, Scotland Yard said, adding that a murder investigation had been launched.

In another incident, an 18-year-old man was stabbed to death in Southwark in the small hours of Sunday morning .

Police, who have made three arrests, said they were called to a fight on Sutherland Walk, off the Walworth Road.

They could not trace the victim but he presented himself in hospital with stab injuries, where he later died.

Riot police were also deployed on the streets of London last night to disperse a huge crowd that gathered for an "out of control" rave on a north London housing estate.

When police arrived they were pelted with bottles and other missiles. Officers found a man and woman stabbed at the scene.

The man was rushed to hospital in critical condition. The woman's injuries were said to be non-life threatening.

Police said the NPAS helicopter was deployed along with police dogs. One arrest was made.

The incidents come amid a spate of knife attacks in the capital, with teenager Yusuf Mohamed stabbed to death while trying take cover in a Shepherd's Bush convenience store on Wednesday evening.

Anyone with information should contact police on 101.