Appeal over Mill Hill murdered teenager Marvin Henry
Detectives have issued a photo of a teenager who was murdered in north-west London on Wednesday.
The victim, 17-year-old Marvin Henry, from Mill Hill, suffered a fatal gunshot wound to his chest.
He was found by police who were called at 0025 BST on Wednesday to a disturbance near the junction of Bray Road with Bittacy Hill in Mill Hill.
A 21-year-old man who was arrested on Thursday remains in custody at a north London police station.
Ten males aged between 14 and 18, and a 21-year-old woman, who were arrested on Wednesday, have been bailed to return in late November pending enquiries.
Det Ch Insp Nicky Wall, who is heading the investigation, said: "The circumstances leading up to the death are still unclear.
"What we do know is that there would have been a number of people at the location and possibly some commotion between them.
"I am appealing to anyone who was there or may have seen or heard anything to come forward and speak to us."
The 17-year-old was the second teenager to be shot dead in London in four days.
He is the 17th teenager to be murdered in London this year.