A 14-year-old boy charged with the murder of 12-year-old Ava White, who suffered "catastrophic injuries" in an assault in Liverpool city centre on Thursday, has been remanded into secure accommodation.
The youth, who cannot be named for legal reasons, was also charged with possession of a bladed article.
He wore a grey tracksuit and sat in the dock for a five-minute hearing. He is due to appear at Liverpool Crown Court on Wednesday.
When the boy was charged late last night Merseyside Police said: "Three other boys arrested have been conditionally bailed as extensive inquiries continue."
The force said it was "vitally important" that no one "posts comments or names on social media which could potentially impact upon us getting justice for Ava's family".
Detective Superintendent Sue Coombs asked people to "trust us that we are doing all we can to investigate and update people on this tragic incident".
"We do not want anything to jeopardise this," she added.
DS Coombs asked anyone who captured the incident or aftermath to send images or footage to the force online using this link.
On Friday, flowers were laid on Church Street in tribute to Ava, as forensics officers and police searched the scene.
A balloon was left by 17-year-old Lacey, who did not want to give her surname, who said her younger sister had been close friends with the year 9 pupil.
She said: "She was just a bubbly character, so loving and caring.
"She came out with her friends to enjoy herself and I think it's just wrong that this has happened."
Headteacher Peter Duffy of Notre Dame Catholic College where Ava was a pupil said: "She was an incredibly popular girl with a fantastic group of friends."
Those with information are asked to call 101, use Facebook, or contact Crimestoppers, anonymously, on 0800 555 111, using reference 21000820789.