A pair of teenagers were killed within minutes of each other in different parts of London, while three men were stabbed in a separate attack in the capital hours later.

Scotland Yard said 14 people have been arrested in connection with the three incidents, two of which happened on Friday afternoon and the other in the early hours of Saturday morning.

London mayor Sadiq Khan said he was “sickened” following the deaths of the two teenage boys and condemned the “scourge of violence” in the capital.

Emergency services were called out to Wandsworth in south-west London, on Friday evening where the first victim – believed to be in his late teens – was found stabbed.

He died at the scene and is yet to be formally identified, with a post-mortem examination due to be held. Six males were later arrested and taken to separate west London police stations for questioning.

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Within minutes later, armed police were called to reports of a shooting in Plumstead, in the south-east of the capital.

The victim, also believed to be in his late teens, was found with critical injuries. The London Ambulance and the London Air Ambulance attended, but the teenager died at the scene a short while later.

The victim has yet to be formally identified and police were working to notify his next of kin. Three men and a woman were later arrested on suspicion of murder and taken to separate south London police stations for questioning.

In the early hours of Saturday morning, police were called to Clapham following reports of a fight.

Three men were found with stab and slash injuries. The condition of two of the men is unknown, while the third has injuries which are not life-threatening or life-changing.

Police cordon on Bedford Road in Clapham after three men stabbed (PA)

Four men were arrested in connection with the incident – two for violent disorder, one accused of carrying a bladed instrument and another for possession of a Taser – and have been taken into custody at a south London police station.

Mr Khan said: “I am sickened to hear that two young lives have been ended within minutes of each other in Wandsworth and Greenwich. Our overstretched police are working around the clock to keep Londoners safe. They need our support to end this scourge of violence.

“Anybody who has information about what happened either in Wandsworth or Greenwich should do the right thing and call the police.”

Tooting MP Rosena Allin-Khan said the suspected murder in Wandsworth was “heartbreaking” and “absolutely tragic”.