GMP and partners have been planning the operation for the past six months....
He was found guilty of manslaughter....
Two males were found with stab wounds....
Behind bars where he belongs....
Police have released a formal statement....
Four arrests have now been made in total....
Detectives are urgently appealing to the public....
"Bell is a danger to society and had total disregard for my life."...
Crucial investigations are ongoing....
