Police investigating the fatal stabbings of two 17-year-olds have made a string of arrests.
Scotland Yard said yesterday that a second male had been arrested on suspicion of murdering teenager Jodie Chesney.
She was stabbed in the back last Friday as she socialised with friends in a park in Harold Hill, east London.
Officers also arrested three males, aged 15, 17 and 18, on suspicion of murdering the second teenager in West Kensington.
The victim was named locally as Ayub Hassan, with a family friend paying tribute to him as a "kind and handsome" boy with ambitions of becoming a barrister.
Jodie was in the park when she was approached by two males and knifed from behind in what police called a "savage, evil attack". Scotland Yard gave no age for the male who is in custody after being arrested in London yesterday morning.
A 20-year-old man arrested in Leicester on Tuesday evening remains in custody on suspicion of her murder, police said.
Jodie was with five other teenagers in the park when they became aware of two males who left at around 9pm without interacting with them, police said. About 30 minutes later, the pair returned and one stabbed Jodie in the back without saying a word, officers added.
Ayub was found with stab injuries to the chest in Lanfrey Place on Thursday afternoon.
After laying flowers at the scene, family friend Amina Osman said: "He had ambitions, he was looking forward to being a barrister. "He was looking forward to being a grown-up man. He was good with his words, he was very kind and handsome."
But she said the fatal attack was "the fourth attempt on his life", having previously been found unconscious in a park, run over and having been stabbed on another occasion.
Community support worker Ms Osman said the boy's mother, Siraad, collapsed with shock when she heard the news of his death.
The three suspects remained in custody after being arrested on Thursday, the Met said.