Police made 14 arrests after three separate London attacks left two teenagers dead and three men injured in the space of 12 hours.
A 18-year-old man was stabbed to death at about 16:42 BST on Friday in Wandsworth, south London.
Police were called minutes later, at 16:54, to Plumstead, south-east London, where a teenager was shot dead.
Three men were then stabbed during a fight in Clapham, south-west London, at about 03:22 on Saturday.
The condition of two of the men is not yet known, while the third has injuries not deemed to be life-threatening or changing.
London mayor Sadiq Khan said he was “sickened” following the death of the two teenagers.
Six males – aged between 16 and 19 – have been arrested on suspicion of murder of the teenager in Wandsworth, who died from stab wounds in Deeside Road.
Tooting MP Rosena Allin-Khan said the killing was “heartbreaking” and “absolutely tragic”.
After the shooting in a car park on Hartville Road in Plumstead, three men and a woman were arrested on suspicion of murder.
Armed police, local officers, the London Ambulance Service and London Air Ambulance all attended, but the teenage victim died a short while later.
Four men have been arrested in connection with the multiple stabbing on Bedford Road in Clapham – two for violent disorder, one for carrying a bladed instrument and the other for possession of a Taser.
The two deaths take the total number of murders in London in 2019 up to 55.
Last year there were 132 homicides – the highest level for a decade.