Teen killed wanted to make 'world a better place'

The head teacher of a 14-year-old boy who was stabbed to death in Manchester said he was "committed to making the world a better place".
Ibrahima Seck died in hospital after he was attacked outside the Fairway Inn pub in New Moston at about 17:00 BST on Sunday.
Three teenagers - two aged 14 and a 16-year-old - have been arrested on suspicion of murder.
Louise Hodson, executive head teacher of Greater Manchester Independent School, said Ibrahima's infectious energy "lit up every room" and his death had left a "huge hole" in the school community.
She said Ibrahima had a 100% attendance rate, was doing the Duke of Edinburgh Award and loved drama lessons at the school.
"Ibrahima was a lively, intelligent and engaging young man whose presence lit up every room.
"Known for his warm, chatty nature, his infectious energy and sense of humour, brought joy to students and staff alike."
Ms Hodson said: "His strong sense of social justice inspired those around him."
'Heartbreaking loss'
"Ibrahima was a happy, compassionate young person, loved by everyone who knew him, and has left an indelible mark on our school."
She said: "His absence leaves a huge hole in our school community, and he will be missed more than words can say."
Ms Hodson added the school was supporting students and staff "as we all try to come to terms with this heartbreaking loss".
Ibrahima's parents have paid tribute to their "funny, caring" and "well-liked" son.
"He was so smiley and always made everybody laugh," they said.
His father left flowers at the scene of the attack on Monday.
His mother had to be held up by loved ones while his father showed reporters an image of his son on his mobile phone and repeated "he's been killed" before laying flowers where the attack happened beside a picture of Ibrahima and tributes from the community.
A 14-year-old girl and a 37-year-old woman had also been arrested on suspicion of assisting an offender, Greater Manchester Police said.
Det Ch Insp Tony Platten said the incident had "rocked the local community" and urged anyone with information to contact the force.
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