A 15-year-old girl has been arrested in connection with the death of a teenager who was found stabbed.
Babacar Diagne, also 15, was pronounced dead at the scene on grassland in the Wood End area of Coventry on Wednesday night.
A post-mortem examination carried out on Thursday found that Babacar, who was living in Coventry after previously living in Sutton Coldfield, had suffered multiple stab wounds.
The 15-year-old girl was arrested just before 10.30am on Sunday on suspicion of conspiracy to commit murder, West Midlands Police said.
She has been taken into police custody where she will be questioned over her involvement in the stabbing.
Two 15-year-old boys, who were arrested earlier this week, remain in custody after officers were granted court extensions allowing extra time to question them on suspicion of murder.
Police said it is understood that Babacar was attacked by three black males who arrived at the murder scene on pedal cycles.
The reason behind the attack still remains unclear, but detectives are working on a number of possible motives.
Detective Chief Inspector Scott Griffiths, who is leading the investigation, said: "We've made fantastic progress on the case but my team will continue to work around the clock until we are satisfied we have caught everyone involved in this awful attack.
"Although we've already made 10 arrests to date, I am still urging anyone who suspects they know who was involved, or saw anything suspicious near Petitor Crescent on Wednesday night, to please get in touch.
"The people responsible do not deserve protection. They have killed a child and we all collectively need to make a stand to show this is not acceptable."