"If love was enough, she would be here with us right now celebrating."...
A man, 55, has also been arrested....
Can you help?...
Mohanad Abdullaahi Goobe was just 15 years old....
He remains in custody for questioning....
More and more tributes are continuing to flood in....
Police are appealing for witnesses....
Jen Higgins, 49, founded Manchester-based Carousel PR....
He mocked his victim while she bled from her head....