Four men – aged 21, 27, 31 and 71 – have been arrested on suspicion of murder after police were called to reports of a fight in Hounslow on Wednesday morning.
The teenage victim was found at the scene with stab wounds and despite the efforts of the emergency services, was pronounced dead.
Detective Inspector Martin Thorpe said: “We are working around the clock to find those responsible for Simarjeet’s murder, as his family struggle to come to terms with their loss.
“Four men have been arrested and our enquiries continue.
“I would urge anyone with information about how the events unfolded or anyone who may have captured the incident on their phone, dash cameras or doorbell footage to please come forward.”
Detective Superintendent Figo Forouzan added: “Our thoughts remain with Simarjeet’s family at this extremely difficult time.
