The teenager, who cannot be named for legal reasons, claimed he accidentally stabbed Ava, 12, in self-defence after a row over a Snapchat video in Liverpool city centre on November 25 last year.
www.dailymail.co.uk
"A schoolboy broke down in tears today as he was found guilty of murdering 12-year-old Ava White at a Christmas lights switch-on - while the girl's family cheered the verdict from the public gallery.
The 14-year-old, who cannot be named for legal reasons, had claimed he accidentally stabbed Ava in self-defence after a row over a Snapchat video during the festive event in Liverpool.
But a jury took two hours and eight minutes to convict him of murder, with more than 20 members of Ava's family celebrating after the jury foreman read the verdict.
The teenager, who appeared on video-link throughout the trial, put his head in his hands. He now counts among the UK's youngest convicted murderers.
CCTV footage showed the 'callous' boy and his friends going into a shop after the stabbing, where they bought butter for crumpets and arranged his hair for a selfie before going home to play Call Of Duty on a PlayStation 4."