Two men have been stabbed to death within the space of two hours in Camden, north London.
Abdikarim Hassan, 17, died in Bartholomew Road at 21:08 GMT on Tuesday. Sadiq Adan Mohamed, 20, died after being stabbed in Malden Road at about 22:10.
Mr Mohamed’s family said they were “devastated” and revealed that his brother was killed in September.
The Met Police is trying to determine if the killings are linked.
Mr Mohamed was given first aid but died at the scene near the junction with Marsden Street.
His family said in a statement: “We the family and the entire Somali community in Camden are devastated. This is now the constant theme in our community.
“We are made to believe that the police are here to protect us, but how does a mother feel her kids are protected when she has lost two in the same vicinity within months?
“We have lots of questions and need answers. Somebody has to listen to us.”
Met Police is trying to establish whether the two deaths are linked
Neighbour Layla Awod said Abdikarim Hassan was on his way back home from college when he was stabbed.
She said his mother saw him lying on the floor dying after being refused to pass through the police security cordon. She knew it was her son when she called his mobile phone and heard it ringing the other side of the cordon, she said.
Mr Hassan’s uncle, Yusuf Ahmed, said the teenager came to the UK from Somalia when he was two-years-old and was the eldest of six children.
He was a student at Westminster College, liked playing football, and was a “good guy” who was “always smiling”.
Mr Ahmed described his nephew as “very helpful”, adding: “He was helping his mum, whenever he was off from college, he was taking his siblings to school.”
Denise Arnold, 63, who lives in Malden Road, said she saw “a large group of people” trying to resuscitate Mr Mohamed and recalled hearing “a lot of wailing and screaming”.
Following the deaths, additional police patrols were sent to Camden overnight and a Section 60 order – giving them powers to stop and search people – was authorised across the borough until 07:00.
A police spokesperson said murder investigations had been launched but no arrests had been made and “urgent inquiries are under way to establish the full circumstances”.
Sixteen people have been stabbed to death in London since the start of 2018. Five of those were teenagers.
Less than two miles away from Tuesday night’s first stabbing – and only minutes earlier – a 16-year-old boy was stabbed in Aldenham Street, Camden.
Police were flagged down at 20:22. Paramedics took the boy to a central London hospital with non life-threatening injuries.
A 24-year-old man was arrested at the scene on suspicion of GBH with intent, but has since been released. No further action will be taken against him.
Camden Police were called to another stabbing on Tuesday afternoon where a man, thought to be in his 40s, was attacked in Kilburn High Road shortly before 15:30.
He was taken to hospital by London Air Ambulance and is in a stable condition.
cordon was set up around the road where Mr Mohamed was killed
A 19-year-old man who lives near Bartholomew Road told BBC Radio London stabbings were now “everyday behaviour for these youngsters”.
“It’s just normal now. It’s getting to the point where it’s getting ridiculous.”
Mayor of London Sadiq Khan said he was “desperately saddened” by the deaths.
“I am asking the prime minister and the home secretary to urgently meet with me to discuss how we can work together to tackle the evil of knife attacks.”
Meanwhile Cressida Dick, the commissioner for the Met Police, asked all Londoners to “think about what you can do to help us tackle this blight on our city”.
“The frequency with which some of our young people are prepared to take each other’s lives is shocking,” she said.
“For two young men to be murdered so close together – both in time and geography – makes this even harder to comprehend.”
She urged young Londoners to “stop and think” before carrying a knife.