Police investigating the shooting of nine-year-old Olivia Pratt-Korbel in Liverpool have warned her killer: "We will not rest until we find you and we will find you."Detective Chief Superintendent Mark Kameen, head of investigations at Merseyside Police, said the force was pursuing a "number of very positive lines of inquiry" following the murder on Monday.

Police investigating the shooting of nine-year-old Olivia Pratt-Korbel in Liverpool have warned her killer: "We will not rest until we find you and we will find you."Detective Chief Superintendent Mark Kameen, head of investigations at Merseyside Police, said the force was pursuing a "number of very positive lines of inquiry" following the murder on Monday.